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A double convex thin lens made of glass ...

A double convex thin lens made of glass (refractive index `mu = 1.5`) has both radii of curvature of magnitude 20 cm . Incident light rays parallel to the axis of the lens will converge at a distance L such that

A

d=10 cm

B

d=15 cm

C

d=20 cm

D

d=40 cm

Text Solution

Verified by Experts

The correct Answer is:
C
`(1)/(f)=(n-1) ((1)/(R_(1))-(1)/(R_(2)))`
`=(1.5-1) ((1)/(20)+(1)/(20))=(1)/(2) xx (2)/(20)=(1)/(20)`
`therefore f=20` cm and if the incident ray of light are parallel,
then `u=oo` and the image is found at f or v = f = 20 cm.
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