---
title: Lenses and eyes — how Mova does on the tests · Physics
description: Lesson 22 of the physics course of Mova's primary school: 5 of 10 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/school-run/physics/22-lenses-and-eyes/)

<!-- crumbs -->
[home](https://md.mova.elamur.ai/free/en/) / [at school](https://md.mova.elamur.ai/free/en/school-run/) / [Physics](https://md.mova.elamur.ai/free/en/school-run/physics/) / 22

# Lenses and eyes

<!-- .vintro -->
**Tests:** 5 of 10 right · **Exam:** 2 of 4 right · **Kind:** ★★ · **Understood:** 4 of 14 · **Run:** 2026-10-18, commit `f3c23ea72`

<!-- .vabout -->
Lesson 22 of the physics course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: [the lesson in the corpora](https://md.mova.elamur.ai/free/en/corpora/school/physics/22-lenses-and-eyes/).

<!-- .vabout -->
Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/).

<!-- div qa ok -->

### Test 1 · ★★ · right ✓ {#t1}

<!-- .q -->
Why does the "puddle" on a hot road vanish when you get close?

- **1.** It was the sky's light bent by hot air, not water — **← Mova's choice** · **✓ the right answer** · score 4
- **2.** It sinks into the road — no support
- **3.** It dries up in the time it takes you to walk there — no support
- **4.** Cars splash it away — no support

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 1 with score 4, the only option with support. Its support: lesson 13, line 1: «The deeper you go in water, the harder it presses, because more and more water is piled up above you; you feel it in your ears at the bottom of a deep pool.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «water» (+3); the same circumstance (+2). Against it: a different action (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t1/)

<!-- /div -->

<!-- div qa no -->

### Test 2 · ★★ · wrong ✗ {#t2}

<!-- .q -->
bruv, eclipse today, i'll just wear me sunnies and stare at it yeah?

- **1.** Yes, if you only look for an hour — **← Mova's choice** · no support
- **2.** No, but squinting makes it safe — no support
- **3.** No, sunglasses are not enough, use eclipse glasses or a pinhole — **✓ the right answer** · no support
- **4.** Yes, sunglasses are fine — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t2/)

<!-- /div -->

<!-- div qa ok -->

### Test 3 · ★★ · right ✓ {#t3}

<!-- .q -->
In a cartoon a kid zaps ants with a magnifying glass for fun. What is the real rule?

- **1.** It only works on cloudy days — no support
- **2.** It cools the ants down — no support
- **3.** That is a harmless game — no support
- **4.** Never point it at the Sun or anything living, it burns — **← Mova's choice** · **✓ the right answer** · score 4

<!-- .why -->
**Why:** It took the question to ask what it is done to. It chose option 4 with score 4, the only option with support. Its support: lesson 22, line 7: «A magnifying glass can focus sunlight into a hot spot that starts fires, so it is never pointed at the Sun or at anything living.», reached through a sentence linked to the one the question matched. What matched: the same action «point» (+3); the same place «sun» (+2). Against it: a different thing acted on (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t3/)

<!-- /div -->

<!-- div qa ok -->

### Test 4 · ★★ · right ✓ {#t4}

<!-- .q -->
Why is staring at the Sun extra dangerous, compared with touching something hot?

- **1.** The damage does not hurt, so you do not know to stop — **← Mova's choice** · **✓ the right answer** · no support
- **2.** It only harms people who wear glasses or contact lenses — no support
- **3.** It hurts so much that you stop at once — no support
- **4.** It only damages your eyelids — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t4/)

<!-- /div -->

<!-- div qa no -->

### Test 5 · ★★ · wrong ✗ {#t5}

<!-- .q -->
Your grandad can read the bus number far away but needs glasses for his book. What is he?

- **1.** Colour-blind — **← Mova's choice** · no support
- **2.** Short-sighted — no support
- **3.** Long-sighted — **✓ the right answer** · no support
- **4.** Night-blind — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t5/)

<!-- /div -->

<!-- div qa no -->

### Test 6 · ★★ · wrong ✗ {#t6}

<!-- .q -->
What would happen to the pinhole picture if you made the hole bigger?

- **1.** It would turn round the right way up — **← Mova's choice** · no support
- **2.** It would get brighter but blurrier — **✓ the right answer** · no support
- **3.** It would become much sharper and clearer — no support
- **4.** It would disappear completely from view — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t6/)

<!-- /div -->

<!-- div qa no -->

### Test 7 · ★★ · wrong ✗ {#t7}

<!-- .q -->
Why does a telescope with a bigger lens show fainter stars?

- **1.** A bigger lens makes stars hotter — **← Mova's choice** · score 3
- **2.** A bigger lens brings stars closer — score 3
- **3.** A bigger lens shines light on the stars — score 2
- **4.** A bigger lens catches more light — **✓ the right answer** · score 2

<!-- .why -->
**Why:** It took the question to ask why something happens (its cause). It chose option 1 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 22, line 8: «The lens in your eye makes an upside-down picture on the back of the eye, and the brain turns it the right way up.», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+3); the same doer «lens» (+1). Against it: a different thing acted on (counts against) (-1). The right option, 4, scored 2. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t7/)

<!-- /div -->

<!-- div qa ok -->

### Test 8 · ★★ · right ✓ {#t8}

<!-- .q -->
You come out of a dark cinema into bright sunshine and it hurts for a moment. Why?

- **1.** Your pupils are still wide open and let in too much light — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The sunshine got stronger while you were inside — no support
- **3.** The film used up the light in your eyes — no support
- **4.** Cinemas make your eyes weaker for ever — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t8/)

<!-- /div -->

<!-- div qa no -->

### Test 9 · ★★ · wrong ✗ {#t9}

<!-- .q -->
How does a message cross the ocean on the internet?

- **1.** By ships carrying the letters — **← Mova's choice** · no support
- **2.** By wind blowing the signal across — no support
- **3.** As flashes of light inside glass fibres under the sea — **✓ the right answer** · no support
- **4.** By sound sent through the water from one coast to another — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t9/)

<!-- /div -->

<!-- div qa ok -->

### Test 10 · ★★ · right ✓ {#t10}

<!-- .q -->
Which is true about the picture inside your eye?

- **1.** It is the right way up, and the brain then flips it over — no support
- **2.** It is upside down, and the brain turns it the right way — **← Mova's choice** · **✓ the right answer** · score 6
- **3.** It is in black and white only — no support
- **4.** There is no picture inside the eye — no support

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 2 with score 6, the only option with support. Its support: lesson 22, line 8: «The lens in your eye makes an upside-down picture on the back of the eye, and the brain turns it the right way up.», reached through a sentence linked to the one the question matched. What matched: the same action «turn» (+4); the same doer «brain» (+3). Against it: a different thing acted on (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/t10/)

<!-- /div -->

<!-- div qa no -->

### Exam question 1 · formal language · wrong ✗ {#e1}

<!-- .q -->
Identify the principal function of the crystalline lens of the human eye.

- **1.** To exclude particles of dust from the eye — **← Mova's choice** · no support
- **2.** To store visual images for subsequent recall — no support
- **3.** To refract light so as to form a focused image upon the retina — **✓ the right answer** · no support
- **4.** To emit light whereby the objects before the eye are illuminated at night — no support

<!-- .why -->
**Why:** Nothing it remembers matched the question, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/e1/)

<!-- /div -->

<!-- div qa no -->

### Exam question 2 · formal language · wrong ✗ {#e2}

<!-- .q -->
Which of the following statements most accurately characterises the hazard of observing the Sun directly?

- **1.** Ordinary sunglasses afford complete protection — **← Mova's choice** · no support
- **2.** No injury can result from brief observation — no support
- **3.** The retina may be permanently injured without any sensation of pain — **✓ the right answer** · no support
- **4.** The injury is invariably accompanied by intense pain — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/e2/)

<!-- /div -->

<!-- div qa ok -->

### Exam question 3 · formal language · right ✓ {#e3}

<!-- .q -->
It is given that a pinhole camera forms an image. Determine the orientation of the image so formed.

- **1.** Inverted — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Rotated through a quarter turn — no support
- **3.** Upright — no support
- **4.** Reversed in colour only — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/e3/)

<!-- /div -->

<!-- div qa ok -->

### Exam question 4 · formal language · right ✓ {#e4}

<!-- .q -->
Ascertain the nature of the apparent sheet of water observed upon a heated road surface.

- **1.** Light from the sky refracted by heated air adjacent to the road — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Vapour emitted by the road surface — no support
- **3.** Water deposited by passing vehicles — no support
- **4.** A reflection of the observer's own shadow — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/22-lenses-and-eyes/e4/)

<!-- /div -->

<!-- pn -->
- ← previous: [21. Mirrors, rainbows and the blue sky](https://md.mova.elamur.ai/free/en/school-run/physics/21-mirrors-rainbows-and-the-blue-sky/)
- next →: [23. Heat moves: hot to cold](https://md.mova.elamur.ai/free/en/school-run/physics/23-heat-moves-hot-to-cold/)
- ↑ back to [Physics](https://md.mova.elamur.ai/free/en/school-run/physics/)