What is Snell’s window?

Write a note on optical fibre.

What are primary focus and secondary focus of a lens?

What are the sign conventions followed for lenses?

What is Rayleigh's scattering?

What is call 'grating element'?

What are resolution and resolving power?

What is Rayleigh’s scattering?

What is double refraction?

Why is oil immersed objective preferred in a microscope?

What are the advantages and disadvantages of a reflecting telescope?

What are the uses of spectrometer?

What is myopia? What is its remedy?

What is presbyopia?

What is astigmatism? What is its remedy?