Geometrical OpticsHard

Question

An object 2.4 m in front of a lens forms a sharpimage on a film 12 cm behind the lens. A glassplate 1 cm thick, of refractive index 1.50 isinterposed between lens and film with its planefaces parallel to film. At what distance (fromlens) should object be shifted to be in sharpfocus on film ?

Options

A.5.6 m
B.7.2 m
C.2.4 m
D.3.2 m

Solution

       

Shift
New image position

Change = 560 - 240 = 320 cm

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