Question Library

A ray from a fixed object is incident on a plane mirror at an angle of 20o. If the mirror is rotated through 30o by how many degree would the reflected ray rotate?

Which of the following distances is usually adjustable in the camera? The distance between the

In which of the following media would sound wave travel fastest?

A paralIel beam of unpolarized light is incident on a plane glass of refractive index 1.60 at an angle to the normal. If the reflected beam is completely polarized, calculate the angle of incidence of the beam.

List three observations in support of the de-Broglie's assumptions that moving particles behave like waves.

(a) With the aid of ray diagrams, explain total internal reflection. (b) Describe, with the aid of a labelled diagram, the essential features of an astronomical telescope in normal adjustment. (c) A converging lens forms a real image of a real object. If the magnification is 2 and the distance between the image and the object is 90.0 cm, determine the (i) focal length of the lens; (ii) object distance for which the image would be the same size as the object.

You have been provided with a rectangular glass prism, optical pins, and other necessary apparatus. Using the above diagram as a guide, carry out the following instructions: Fix the drawing paper provided to the drawing board Place the glass prism on the drawing paper and trace the outline, ABCD of the prism Remove the prism, mark a point O on AB such that AO is about one-quarter of AB Draw a normal through point O. Also draw an incident ray to make an angle i = 25 with the normal at O. Fix two pins at \(P_1\) and \(P_2\) On the incident ray. Replace the prism. Fix two other pins at \(P_3\) and \(P_4\) such that the pins appear to be in a straight line with the images of the pins at \(P_1\) and \(P_2\) when viewed through the block along DC remove the prism. Join points Pa and P4 and produce it to meet DC at 1. Also, draw a line to join Ol ( With O as center and using any Concinient radius, draw a circle to Cut the incident ray and the refracted ray at E and H respectively. Maintain this radius throughout the experiment Draw the perpendiculars EF and GH. Measure and record d= EF and I= GH. Repeat the procedure for four other values of i = 35^\circ, 45, 55^\circ, and 65^\circ respectively. In each case measure and record d and I Plot a graph of d on the vertical axis against I on the horizontal axis Determine the slope of the graph State two precautions taken to ensure accurate results. [Attach your traces to your answer booklet) (b)i. State Snell's law. ii. Calculate the critical angle for a water-air interface. [refractive index of water = \(\frac{4}{3}\)]

Marching soldiers crossing a suspension bridge are usually advised to break their steps to avoid damaging the bridge owing to

The sharpness of the boundary of the shadow of an object is determined by the

A real image three times the size of an object is formed 24cm from a converging mirror. what is the focal length of the mirror.

The figure above shows a plot of angles of deviation through a glass prism when light is incident at \theta degrees on the prism. The incident angle that produces the minimum deviation is

The frequency of a swinging pendulum is the

Which of the following statements about a progressive mechanical wave is correct?

The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms-1, calculate its period

Radio waves travel in air at 3.0 x 108ms-1. If the waves enter water of refractive index \(\frac{4}{3}\), calculate the speed of radio waves in water