How does an endoscope work?

Arrive at lens equation from lens maker’s formula.

Write a short note on quantum theory of light.

Define wavefront.

How does wavefront division provide coherent sources?

Mention the differences between interference and diffraction.

State Brewster’s law.

What are the uses of spectrometer?

It is possible for two lenses to produce zero power?

What are the assumptions made while considering refraction at spherical surfaces?

Define bandwidth.

Why is the interference pattern not detected when two coherent sources are far apart?

(i) Explain briefly how the focal length of a convex lens changes with increase in wavelength of incident light.
(ii) What happens to the focal length of convex lens when it is immersed in water ? Refractive index of the material of lens is greater than that of water.

A convex lens is held in water. What would be the change in the focal length?

How does focal length of a lens change when red light is replaced by blue light?