have focussed on a screen the image of candle fla

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Q.
Suppose you have focussed on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the Sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the :

1 lens slightly towards the screen

2 lens slightly away from the screen

3 lens slightly towards the sun

4 lens and screen both towards the sun

Ans.
(1)

Since, candle is at the farthest end but not at the infinity. So, image will be formed between focus and centre of curvature of lens, but parallel rays from sun will converge at the focus. So, the distance between lens and screen should be reduced to get the image of the Sun.

Solution

1 lens slightly towards the screen

2 lens slightly away from the screen

3 lens slightly towards the sun

4 lens and screen both towards the sun

Ans.
(1)

Since, candle is at the farthest end but not at the infinity. So, image will be formed between focus and centre of curvature of lens, but parallel rays from sun will converge at the focus. So, the distance between lens and screen should be reduced to get the image of the Sun.

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Solution

1 lens slightly towards the screen

2 lens slightly away from the screen

3 lens slightly towards the sun

4 lens and screen both towards the sun

Ans. (1) Since, candle is at the farthest end but not at the infinity. So, image will be formed between focus and centre of curvature of lens, but parallel rays from sun will converge at the focus. So, the distance between lens and screen should be reduced to get the image of the Sun.

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Ans.
(1)

Since, candle is at the farthest end but not at the infinity. So, image will be formed between focus and centre of curvature of lens, but parallel rays from sun will converge at the focus. So, the distance between lens and screen should be reduced to get the image of the Sun.