Question Library

Light of wavelength 589 nm in vacuum passes through a piece of fused quartz of index of refraction n = 1.458. What is the frequency of the light in fused quartz? [Speed of light c = \(3.00×10^8 ms^{-1}\)]

A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of \(40^o\) with the normal. Calculate the angle of refraction in the glass. [Refractive index of water = 1.33, Refractive index of glass = 1.5]

The power of the lens is +2.5D. What is the radius of the curvature?

Which of the folowing statements about light travelling from one material medium to another is not correct?

A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is?

The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?

The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?

An image formed on a screen is always?

A ray of light traveling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30\(^o\). Calculate the angle of refraction. [Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]

A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.

You are provided with a metre rule, lens, screen, ray box, and other necessary apparatus. i. Set up the experiment as shown in the diagram above. Measure and record the diameter a\(_{0}\), of the illuminated object. ii. Place the object at a distance x= 25cm from the lens. Adjust the screen until a sharp image is obtained on the screen. iii. Measure and record the diameter, a, of the image. iv. Measure and record the distance v between the lens and the screen. v. Evaluate y = P = \(\frac{1+y^{2}}{y}\) and T= x+v. vi. Repeat the procedure for x = 30cm, 35cm, 40cm and 45cm. In each case, determine the corresponding values of a,v,y, P and T. vii. Tabulate your results. viii. Plot a graph of P on the vertical axis against T on the horizontal axis starting both axes from the origin (0,0). ix. Determine the slope, s, of the graph. x. Determine the intercept, c, on the horizontal axis. xi Evaluate K = \(\frac{c}{2}\) xii. State two precautions taken to ensure accurate results. (b)i. Explain the statement, the focal length of a converging lens is 20cm. ii. An object is placed at a distance x from a converging lens of focal length 20cm. If the magnification of the real image is 5, calculate the value of x.

Total internal reflection will not occur when light travels from

A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance

An object is embedded in a block of ice, 10 cm below the plane surface. if the refractive index of the ice is 1.50, the apparent depth below the surface is?

Dispersion occurs when white light passes through a glass prism because of the?