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Ray Optics and Optical Instruments

Refraction Of Light By Spherical Lenses (Convex Lens And Concave Lens)

An object is placed at a distance of 20 {~cm} from a equi-conc

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Solving time: 3 mins

An object is placed at a distance of $20 cm$ from a equi-concave lens of focal length $30 cm$ , whose one surface is silvered. If the radius of curvature of the silvered surface is $60 cm$ , find the position and nature of the image.

Image will be virtual, erect and diminished

Image will be real, erect and diminished

Image will be large

Image will be upright,virtual

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An object is placed at a distance of

20 cm

from a equi-concave lens of focal length

30 cm

, whose one surface is silvered. If the radius of curvature of the silvered surface is

60 cm

, find the position and nature of the image.

13 mins ago

Discuss this question LIVE

13 mins ago

Text solutionVerified

\frac{- 1}{F} = \frac{2}{f} - \frac{1}{f _{m}} = \frac{2}{- 30} - \frac{1}{+ 30} = - \frac{3}{30} \Rightarrow F = + 10 cm ∴ \frac{1}{F} = \frac{1}{v} + \frac{1}{u} \Rightarrow \frac{1}{10} = \frac{1}{v} + \frac{1}{- 20} \Rightarrow v = + 20/3 cm as m = - \frac{v}{u} = - \frac{- 20/3}{- 20} = \frac{1}{3}

∴

Image will be virtual, erect and diminished.

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Question Text	An object is placed at a distance of $20 cm$ from a equi-concave lens of focal length $30 cm$ , whose one surface is silvered. If the radius of curvature of the silvered surface is $60 cm$ , find the position and nature of the image.
Topic	Ray Optics and Optical Instruments
Subject	Physics
Class	Class 12
Answer Type	Text solution:1
Upvotes	84

An object is placed at a distance of $20 cm$ from a equi-concave lens of focal length $30 cm$ , whose one surface is silvered. If the radius of curvature of the silvered surface is $60 cm$ , find the position and nature of the image.

Text solutionVerified

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An object is placed at a distance of 20 cm from a equi-concave lens of focal length 30 cm, whose one surface is silvered. If the radius of curvature of the silvered surface is 60 cm, find the position and nature of the image.

Text solutionVerified

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An object is placed at a distance of $20 cm$ from a equi-concave lens of focal length $30 cm$ , whose one surface is silvered. If the radius of curvature of the silvered surface is $60 cm$ , find the position and nature of the image.