Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Physics

A light ray is incident normally on the face AB of a right-angled prism ABC (μ = 1.50) as shown in figure. What is the largest angle ϕ for which the light ray is totally reflected at the surface AC?

Find the maximum angle of refraction when a light ray is refracted from glass (μ = 1.50) to air.

Find the angle of deviation suffered by the light ray shown in figure. The refractive index μ = 1.5 for the prism material.

A light ray, going through a prism with the angle of prism 60°, is found to deviate by 30°. What limit on the refractive index can be put from these data?

For paraxial rays, show that the focal length of a spherical mirror is one-half of its radius of curvature.

Consider the diffraction pattern for a small pinhole. As the size of the hole is increased ______.

1. the size decreases.
2. the intensity increases.
3. the size increases.
4. the intensity decreases.

A polariod (I) is placed in front of a monochromatic source. Another polatiod (II) is placed in front of this polaroid (I) and rotated till no light passes. A third polaroid (III) is now placed in between (I) and (II). In this case, will light emerge from (II). Explain.

AC = CO = D, S₁C = S₂C = d << D

A small transparent slab containing material of µ = 1.5 is placed along AS₂ (Figure). What will be the distance from O of the principal maxima and of the first minima on either side of the principal maxima obtained in the absence of the glass slab?

Four identical monochromatic sources A, B, C, D as shown in the (Figure) produce waves of the same wavelength λ and are coherent. Two receiver R₁ and R₂ are at great but equal distances from B.

1. Which of the two receivers picks up the larger signal?
2. Which of the two receivers picks up the larger signal when B is turned off?
3. Which of the two receivers picks up the larger signal when D is turned off?
4. Which of the two receivers can distinguish which of the sources B or D has been turned off?

Draw the graph showing intensity distribution of fringes with phase angle due to diffraction through a single slit. What is the width of the central maximum in comparison to that of a secondary maximum?

Write two points of difference between an interference pattern and a diffraction pattern.

How can you differentiate whether a pattern is produced by a single slit or double slit?

Derive the expression for the angular position of (i) bright and (ii) dark fringes produced in a single slit diffraction.

In a diffraction pattern due to a single slit, how will the angular width of the central maximum change, if orange light is used in place of green light?

Justify your answer.

In a diffraction pattern due to a single slit, how will the angular width of the central maximum change, if the screen is moved closer to the slit?

Justify your answer.

In a diffraction pattern due to a single slit, how will the angular width of the central maximum change, if the slit width is decreased?

Justify your answer.

Draw the intensity distribution for the fringes produced in interference ?

Why are coherent sources necessary to produce a sustained interference pattern?

State the importance of coherent sources in the phenomenon of interference.

Can we conclude from the interference phenomenon whether light is a transverse wave or a longitudinal wave?