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Ray Optics and Optical Instruments

Image formation by Convex Lens

Sunlight of intensity 1,3 {kWm}^{-2} is incident normally on a

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Sunlight of intensity $1, 3 kWm^{- 2}$ 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

Name: Video solution 1: Sunlight of intensity 1,3kWm−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 kWm−2, at a distance 22 cm from the lens on the other side is
Uploaded: 2023-10-06T04:21:21.000Z
Duration: 7 min
Description: Video solution 1: Sunlight of intensity 1,3kWm−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 kWm−2, at a distance 22 cm from the lens on the other side is

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Updated on: Oct 6, 2023

Exam:

JEE Advanced 2018

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Sunlight of intensity

1, 3 kWm^{- 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

7 mins ago

Discuss this question LIVE

7 mins ago

Text solutionVerified

\frac{A _{0}^{'}}{A _{0}} = (\frac{2}{20})^{2} = \frac{1}{100} A_{0}^{'} = \frac{A _{0}}{100} P = I_{0} A_{0} = I_{0}^{'} A_{0}^{'} I_{0}^{'} = \frac{I _{0} A _{0}}{\frac{A _{0}}{100}} = 100 I_{0} = 130 kW / m^{2}

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Question Text	Sunlight of intensity $1, 3 kWm^{- 2}$ 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
Updated On	Oct 6, 2023
Topic	Ray Optics and Optical Instruments
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 1
Upvotes	202
Avg. Video Duration	7 min

Text solutionVerified

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