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  • An object is placed on the principle axis of a concave mirror of focal length 10 cm at a distance of 21 cm from it. A glass slab is placed between the mirror and the object <img alt="" sr

An object is placed on the principle axis of a concave mirror of focal length 10 cm at a distance of 21 cm from it. A glass slab is placed between the mirror and the object

The distance of final image formed by mirror is:

Option: 1

10cm


Option: 2

20cm


Option: 3

30cm


Option: 4

21cm


Answers (1)

best_answer

As we learn

Refraction through parallel slab -

s= t\left ( 1-\frac{1}{\mu } \right )
 

- wherein

s=  shifting of object from slab

t= thickness of slab

\mu = Refractive Index of slab.

 

 shift =3(1-\frac{1}{\frac{3}{2}})=1 cm

Therefore mirror object distance =(21-1)cm=20cm

Therefore object is at the centre of the curvature of the mirror. Hence  light  ray will retrace and image will formed at object itself.

 

Posted by

Sanket Gandhi

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