Optics Answers

Suppose a concave neniscus lens is made firom glass with n = 1.50, with a focal length of 50.0cm and the radius of curvature of the concave surface is 30.0cm. 

i. What is the radius of curvature of the convex surface? Is this a diverging lens or a converging lens? (2 marks)

ii. If I were to use the same lens to magnify a small insect using the same focal length to form a Virtual image, that is, 45.0cm in front of the lens; where should the small insect be

placed? (2 marks)

Conclusion for Free falling

1. An electron in a uniform electric field experiences a force of4.0×10^-11.what are the magnitude and direction of E at this point?

A parallel film of sodium light of wavelength

5880Å is incident on a thin glass plate of μ=1.5 such that

the angle of refraction in the plate is 60o. Calculate the

smallest thickness of the plate which will make it appear

dark at reflection.

ASSERTION (A): IN CASE OF REFRACTION OF LIGHT THROUGH A GLASS SLAB , ANGLE OF INCIDENCE IS EQUAL TO ANGLE OF EMERGENCE .

REASON (R):A GLASS SLAB IS A CUBOID MADE UP OF A GLASS IN WHICH REFRACTION OCCURS FROM THE CORRESPONDING PARALLEL SURFACES.

CHOOSE THE CORRECT OPTION:

(A).BOTH (A) AND (R) ARE TRUE AND (R) IS THE CORRECT EXPLANATION OF (A)

(C).(A) IS TRUE BUT (R) IS FALSE .

(D).(A) IS FALSE BUT (R) IS TRUE

A prism has a refracting angle of 60 degrees and a refractive index of 1.60. calculate the angle of incidence on the first face for a ray that is just totally reflected at the second face of the prism

A prism has a refracting angle of 60° and a refractive index of 1.60. Calculate the angle of incidence on the first face for a ray that is just totally reflected at the second face of the prism. 

A ray is incident at 30° to the normal of a flat piece of uniformly thick glass, as shown in the figure below. If the refractive index of glass is 1.66,

(a)   What is the angle of refraction in the glass?                     [2]

(b)   What is the angle at which the ray emerges from the glass?            [3]

A damped harmonic oscillator given with parameters (m, ω0, β) is subjected to external force of F(t) = f0 sin(ωt). Find out the expression for phase in the oscillation. Plot the phase as a function of driving frequency.