EASY
Earn 100

Assertion: Geometrical optics can be regarded as the limiting case of wave optics.

Reason: When the size of the obstacle or opening is very large compared to the wavelength of light then wave nature can be ignored and light can be assumed to be traveling in a straight line.

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Important Questions on Ray Optics and Optical Instruments

EASY

In a medium the speed of light wave decreases to 0.2 times to its speed in free space. The ratio of relative permittivity to the refractive index of the medium is x:1. The value of x is ______.

(Given speed of light in free space =3×108 m s-1 and for the given medium μr=1)

EASY

The radii of curvature of the faces of a double convex lens made of glass, are 10 cm and 15 cm. Its focal length is 12 cm.

a Find the refractive index of glass

b Calculate its new focal length if the lens is completely immersed in water ( Refractive index of water is 43)

EASY
The dimensional formula of μ00 is _____
EASY
State Heisenberg's Uncertainty principle.
EASY
The refractive index of the material of lens are 1.56 and 1.53 for yellow and red colours of light respectively. If the focal length of lens for yellow colour is 20 cm then calculate the focal length of lens for red colour.
EASY
Charge on an electron is 1.6×10z coulomb. The value of z is _____.
HARD
The relative permittivity of distilled water is 81. The velocity of light in it will be: (Given μr=1
MEDIUM
A compound microscope consists of an objective lens of focal length 1 cm and an eye piece of focal length 5 cm with a separation of 10 cm. The distance between an object and the objective lens, at which the strain on the eye is minimum is n40cm. The value of n is.......
HARD

How fast would a rocket have to go relative to an observer for its length to be corrected to 99% of its length at rest? c=3×108ms-1

HARD

The following graph depicts the inverse of magnification versus the distance between the object and lens data for a setup. The focal length of the lens used in the setup is

Question Image

Distance between the object and the lens m

EASY

What determines the intensity of light in the photon picture of light?

EASY
A laser produces monochromatic light of wavelength 530.4 nm. The power emitted is 3.0 mW. The number of photons emitted per second on an average is h=6.63×10-34 Js, c=3×108ms-1
EASY
Which one of the following particle is a boson?
EASY
Arrange the following electromagnetic radiation per quantum in the order of increasing energy; (i) Red light (ii) γ-ray (iii) X-ray (iv) Radiowave
MEDIUM
Car B overtakes another car A at a relative speed of 40 m s-1. How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A, when the car B is 1.9 m away from the car A?
EASY
Red light differs from blue light as they have :
HARD
For a concave lens of focal length f, the relation between object and image distance u and v, respectively, from its pole can best be represented by (u=v is the reference line):