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QAIPMT-2011-Ph-1920: NEET 2011 Physics - Class 12 AIPMT-2011-Ph-1920 Solution: A biconvex lens has a radius of curvature of magnitude 20 cm.…
A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens?
Multiple Choice Options
- A Virtual, upright, height = 1 cm
- B Virtual, upright, height = 0.5 cm
- C Real, inverted, height = 4 cm
- D Real, inverted, height = 1 cm
Step-by-Step Verified Solution
Focal length of the lens
1 f = ( 1.5 _ 1 ) ( 1 20 _ 1 _ 20 )
_ f = 20 cm
From lens formula
1 v _ 1 u = 1 f
_ 1 v _ 1 _ 30 = 1 20
_ v = 60 cm
I O = m = v u = 60 _ 30 = -2
_ I = -2 _ (O) = -2 _ 2 = -4 cm
So image will be real inverted and of size 4 cm.