Objective Question Papers
Chapter 9: Ray Optics and Optical Instruments
Que 1: Which of the following is not a property of light?
Que 2: Two points P and Q are situated at the same distance from a source of light but on opposite sides. The phase difference between the light waves passing through P and Q will be:
Que 3: The phase difference between the electric and the magnetic field vectors in electromagnetic waves is:
Que 4: A ray of light travelling in air is incident on a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is:
Que 5: Which of the following cannot be polarised?
Que 6: Light year is the unit of:
Que 7: If a mirror is approaching you at a speed of 10 ms-1, the speed with which your image approach you is:
Que 8: The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r.t. water is:
Que 9: The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:
Que 10: A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface?
Que 11: A concave mirror of focal length f produces an image n times the size of the object. If the image is real then the distance of the object is:
Que 12: A thin glass (RI = 3/2) lens has optical power of -5D in air. Its optical power in a liquid medium with RI = 1.6 will be:
Que 13: What happens to the interference pattern if the two slits s1 and s2 in Young’s double experiment are illuminated by two independent but identical sources?
Que 14: What is the reason for your answer to the above question?
Que 15: A single slit diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light?
Que 16: When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is:
Que 17: Two lenses of power -15D and +5D are placed in contact co-axially. The focal length of equivalent lens is:
Que 18: Compared to blue light, the red light diffraction pattern spreads :
Que 19: The air bubble inside water shines due to:
Que 20: Far point of a myopic eye is 40 cm. The dioptic power of a corrective lens is:
Que 21: Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact. The effective power of the combination is:
Que 22: A blue cross on the white background is illuminated with white light and is observed through red filter. What is seen?
Que 23: The angle of deviation for a prism is greatest for:
Que 24: A double convex air bubble in water behaves as:
Que 25: The focal length of a plane mirror of height 12 cm is:
Que 26: If there were no atmosphere, the length of day on the earth will:
Que 27: When a ray of white light enters from air into a glass dense, it undergoes a change in:
Que 28: A ray incident at 15° on one refracting surface of a prism of angle 60° suffers a deviation of 55°. What is the angle of emergence?
Que 29: The intensity of light emerging from the two slits in Young’s experiment is in the ratio 1:4. The ratio of the intensity of the minimum to that of the consecutive maximum will be:
Que 30: What should be the refractive index of a completely transparent medium for it to be visible in a vacuum?
