EASY
Earn 100

What is thick lens? How it is different from the thin lens?

Important Questions on Ray Optics and Optical Instruments

EASY
A thin prism P1 with angle 4° and made from glass of refractive index 1.54 is combined with another thin prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism for P2 is
EASY
A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ, then the angle of incidence is nearly equal to:
EASY
The separation of a beam of light into its constituent wavelengths is called
EASY
How will an image produced ny a lens change if half the lens is wrapped in black paper?
MEDIUM
The focal length of a thin convex lens for red and blue rays are 100 cm and 96.8 cm respectively. Then, the dispersive power of the material of the lens is
EASY

A thin prism of angle 6° made up of glass of refractive index 1.5 is combined with another prism made up of glass of refractive index 1.75 to produce dispersion without deviation. Then find the angle of the second prism.

MEDIUM

Two thin lenses are in contact with each other. One of these is a concave lens of focal length 20 cm and the other is a convex lens of the same focal length. Determine the focal length of the combination and state how it behaves.

MEDIUM
It was found that the refractive index of material of a certain prism varied as 1.5+0.004λ2, where λ is the wavelength of light used to measure the refractive index. The same material was then used to construct a thin prism of apex angle 10°. Angles of minimum deviation δm of the prism were recorded for the sources with wavelengths λ1 and λ2 respectively. Then
MEDIUM
Which is the following colourful patterns is due to diffraction of light?
HARD
A small angled prism of 4° deviates a ray through 2.48°. Find the refractive Index of the prism. 
EASY
Dispersion without deviation is produced by two thin (small angled) prisms which are combined together. One prism has angle 5° and refractive index 1.56. If the other prism has refractive index 1.7, what is its angle?
EASY
Which of the following colour suffers maximum deviation in a prism?
MEDIUM
If the refractive index of the material of a prism is μ and its angle of minimum deviation is π/3 then the angle of the prism is
EASY
The angle of the prism is 60°,angle of deviation is 30°, the incident angle is i and emergent angle is e. For the angle of minimum deviation, the values of i and e will be
EASY
If the refracting angle of a prism is 60° and minimum deviation is 30°, then the angle of incidence will be
MEDIUM
The angle of a prism is 60o . When light is incident at an angle of 60o on the prism, the angle of emergence is 40o . The angle of incidence i for which the light ray will deviate the least is such that
EASY

The word "KVPYis written on board and viewed through different lenses such that board is at a distance beyond the focal length of the lens.

Question Image 

Ignoring magnification effects, consider the following statements.
I Image i has been viewed from the planar side of a plano-convex lens and image
ii from the convex side of a plano-convex lens.
II Image i has been viewed from the concave side of a plano-concave lens and image ii from the convex side of a plano-convex lens.
III Image i has been viewed from the concave side of a plano-concave lens and image ii from the planar side of a plano-convex lens. IV Imagei has been viewed from the planar side of a plano-concave lens and image ii from the convex side of a plano-convex lens.
Which of the above statements are correct?

EASY
A thin prism having refracting angle 10o is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be