One face of a rectangular glass plate `6 cm` thick is silvered. An object held `8 cm` in front of the unsilvered face forms an image `10 cm ` behind the silvered face.Find the refractive index of glass. Consider all the three steps.

Answer

A

Explanation

Applying `h_(app)` for first refraction,
`PI_1=8mu` , (towards left)
`QI_1=PQ+PI_1=(6+8mu)`
`:. QI_2=QI_1=(6+8mu)`, towards right.
`PI_2=PQ+QI_2=(12+8mu)`
Applying `d_(app)=d/mu` for third and last refraction we
have,
`PI_3=((12+8mu)/(mu))=16`
`:. mu=1.5`