Why is the inside portion of the optical instruments like camera, telescope etc. made black?

Optical instrument||Compound telescope

A camera is an optical instrument which makes use of a

Draw a concept map using the following terms. lens, real image, virtual image, optical instruments, camera, microscope, telescope

In activity 1, why does the portion of the pencil inside the water appears to be thicker and broken near the surf ace of water?

In activity 1, why does the portion of the pencil inside the water appears to be thicker and broken near the surf ace of water?

Explain resolving power for optical instruments and explain resolving power of telescopes.

Optical Instruments 3 Telescope| its types and its properties