Which of-the following is not a property of light?
  • It can travel through vacuum
  • It has a finite speed
  • It requires a material medium for its propagation
  • It involve transportation energy
Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be:
  • n
  • 2n
  • \(\frac{π}{2}\)
  • zero
The phase difference between the electric and the magnetic field vectors in electromagnetic waves is
  • \(\frac{π}{4}\)
  • \(\frac{π}{2}\)
  • π
  • zero
A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is :
  • \(\frac{π}{2}\)
  • \(\frac{π}{4}\)
  • π
  • zero
Which of the following cannot be polarised?
  • radiowaves
  • transverse waves
  • sound waves
  • X-rays
Light year is the unit of:
  • distance
  • time
  • intensity of light
  • None of these
If a mirror is approaching you at a speed of 10 ms^1, the speed with which your image approach you is:
  • 10 ms-1
  • 5 ms-1
  • 20 ms-1
  • 15 ms-1
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. to w ater is:
  • 8/9
  • 9/8
  • 7/6
  • 2
The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:
  • \(\frac{1}{√3}\)
  • √2
  • 1
  • can't be determined
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:
  • \(\frac{1}{√3}\)
  • √3
  • \(\frac{1}{3}\)
  • 3
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:
  • (n - 1) f
  • (n + 1) f
  • (\(\frac{n+1}{n}\))f
  • (\(\frac{n-1}{n}\)f
A convergent lens will become less convergent in :
  • oil
  • water
  • both of (a) and (b)
  • none of these
A thin glass (RI = \(\frac{3}{2}\)) lens has optical power of - 5D in air. Its optical power in a liquid medium with RI = 1.6 will be:
  • -2.5 D
  • 25 D
  • -ID
  • 0.625 D
On reflection from a denser medium, a light wave suffers a phase difference of:
  • π
  • \(\frac{π}{2}\)
  • \(\frac{π}{4}\)
  • 2π
The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:
  • geometrical optics
  • physical optics
  • corpuscular optics
  • quantum optics
When light travels from one medium to another, which of the following does not change?
  • frequency
  • refractive index
  • velocity
  • wavelength
Two lens of power -15 D and +5 D are placed in contact co-axially. The focal length of equivalent lens is:
  • -10 cm
  • -20 cm
  • +10 cm
  • None
Refractive index of water and glass are \(\frac{4}{3}\) and \(\frac{5}{3}\). A light ray is going to water from glass. Then, its critical angle will be:
  • sin-1\(\frac{4}{5}\)
  • sin-1\(\frac{5}{6}\)
  • sin-1\(\frac{1}{2}\)
  • sin-1(\(\frac{2}{1}\))
The air bubble inside water shine due to:
  • Reflection
  • Refraction
  • T.l.R.
  • None of these
When a ray of light (white) enters a lens, undergoes a change is:
  • wavelength
  • velocity
  • frequency
  • both velocity and wavelength
0 h : 0 m : 1 s

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