A thin converging lens is used to focus the rays from the #Sun# on to the piece of paper. when the rays burn a hole on the paper, the distance between the lens and the paper is __________ the focal length of the lens. { options are;- } ??

A. less than half
B. equal to half
C. equal to
D. equal to twice

please do do do answer and explain it as well.

Answer 1

C. equal to

In the figure above parallel rays from sun (infinity) after passing through the convex lens are focused to a point F. This point is the focal point.

Therefore, distance between the lens and the paper; where a hole is burnt due to concentration of light rays (heat rays in this instance); is equal to the focal length of the lens.

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Answer 2

Lily Adams

The distance between the lens and the paper is equal to the focal length of the lens.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

A thin converging lens is used to focus the rays from the #Sun# on to the piece of paper. when the rays burn a hole on the paper, the distance between the lens and the paper is __________ the focal length of the lens. { options are;- } ??

A. less than half B. equal to half C. equal to D. equal to twice please do do do answer and explain it as well.

A. less than half
B. equal to half
C. equal to
D. equal to twice

please do do do answer and explain it as well.