Instructions

For each question, enter the correct numerical value (in decimal notation, truncated/rounded-off to the second decimal place; e.g. 6.25, 7.00, -0.33, -.30, 30.27, -127.30) using the mouse and the on-screen virtual numeric keypad in the place designated to enter the answer.

Question 13

Sunlight of intensity 1.3 $$kW 𝑚^{−2}$$ is incident normally on a thin convex lens of focal length 20 𝑐𝑚. Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light, in $$kW 𝑚^{−2}$$, at a distance 22 𝑐𝑚 from the lens on the other side is __________

Correct Answer: e

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