Question

Q/1: Focal-length of parallel sided glass slab is :
A. zero C. 10 cm
B. infinity D. 100 cm​

Answer 1

Answer:

Answer Is Infinite

Explanation:

The emergent ray in rectangular glass slab is parallel to the incident ray so the focal length of glass slab is infinite

Answer 2

The focal length of the parallel-sided glass slab turns out to be 0.

A parallel-sided glass slab and its focus

• A parallel-sided glass is a piece of glass with opposite sides parallel to each other. In a glass slab, the ray coming from infinity will pass through the glass slab without converging.
• The emerging ray is parallel to the incident ray. However, a focal length is obtained when the incident rays converge or appear to converge on extension.

• This proves that the focal length of a parallel-sided glass slab is b)Infinity.

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