A slab of glass, of thickness 6 cm and r...

A slab of glass, of thickness 6 cm and refractive index `mu`=1.5 is placed in front of a concave mirror as shown in the figure. If the radius of curvature of the mirror is 40 cm and the reflected image coincides with the object, then the distance of the object from the mirror is

30 cm

22 cm

42 cm

38 cm

Text Solution

Verified by Experts

The correct Answer is:

(c ) Shift from the slab,
`S=(1-1/mu)t=2 cm`
Let x be the distance between object and mirror. Then,
`x-2=40 or x= 42 cm`

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