Optics Answers

Calculate the critical angle for

(i) an air-glass surface

(ii) an air-water surface

(iii) a water-glass surface

Draw diagrams in each case illustrating the total reflection of a ray incident on the surface

A ray of light is incident in water at an angle of

(i) 30 degree.

(ii) 70 degree on a water glass plane surface. Calculate the angle of refraction in the glass in each case. ( n of glass = 1.5 , n of water = 1.33)

A ray of light is incident at 60degrees in air on air-glass plane surface. Find the angle of refraction in the glass (n for glass = 1.5)

An object is located 50.0cm from a converging lens having a focal length of 15.0cm. Which of the following statements is true regarding the image formed by the lens?

A. It is virtual, upright, and larger than the object

B. It is real, inverted, and smaller than the object.

C. It is virtual, inverted, and smaller than the object.

D. It is real, inverted, and larger than the object.

Why is it advantageous to use a large-diameter objective lens in a telescope?

A. It diffracts the light more effectively than smaller-diameter objective lens

B. It increases its magnification

C. It enables you to see more objects in the field of view.

D. It increases its resolution.

Why is it advantageous to use a large-diameter objective lens in a telescope?

What is meant by plane of polarisation?

Explain why the phenomenon of polarisation is met with in dealing with light waves, but not with sound waves.

Calculate the polarizing angle for light traveling from water, of refractive index 1.33 to glass of refractive index 1.53

Describe and explain 2 methods for producing plane-polarized light.

What is mearnt by

A. Polarized light?

B. Polarizing angle?