Question

What are Plano-concave lenses.answer in sdd detail

Answer 1

Okay your answer is right here:

The plano concave lens are the concave lens that are plane on side and concave on the other.

I have given a picture in the attachment.

These lens as you can see is thicker in the edges and they are thinner in the periphery or middle

This will make you clear:

Suppose a concave lens you cut it into two equal halves then the resulting lens become plano concave

Their uses are as follows:

• Plano-Concave Lenses are ideal for beam expansion, light projection, or for expanding an optical system's focal length.
• Plano-Concave Lenses, which have one concave surface, are Optical Lenses with negative focal lengths.
• These Lenses should be oriented with the plano, or flat, surface towards the desired focal plane.

Hope it helps

___________________________________________________

Answer 2

These lens are mostly used for light projection and beam expansion. For using these in various other optical systems, they are coated with anti-reflective coatings and used to expand light-beams or to increase focal length. They are generally thicker at the edge in comparison to center with one side flat.