Light of wavelength 5000 A falls on a plane reflecting surface. What a

1.	Light of wavelength 5000 A falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?
Answer» X = 5000 A = 5 x 10^-7 m on reflection, no change occurs in wavelength, frequency and speed of the incident light. ∴ Wavelength of reflected light = 5000 Å. Taking C = 3 x 10⁸ ms^-1. The frequency of reflected light is given by V = \(\frac{C}{\lambda}\) = \(\frac{3\times 10^8}{5 \times 10^7}\) = 6 x 10¹⁴ Hz The reflected ray is normal to the incident ray, when the angle of incidence is equal to 45°.

Light of wavelength 5000 A falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Answer»

X = 5000 A = 5 x 10^-7 m
on reflection, no change occurs in wavelength, frequency and speed of the incident light.
∴ Wavelength of reflected light = 5000 Å.
Taking C = 3 x 10⁸ ms^-1. The frequency of reflected light is given by

V = \(\frac{C}{\lambda}\) = \(\frac{3\times 10^8}{5 \times 10^7}\) = 6 x 10¹⁴ Hz

The reflected ray is normal to the incident ray, when the angle of incidence is equal to 45°.

Discussion

No Comment Found

Related InterviewSolutions

A pair of slits 1.5 mm apart is illuminated with monochromatic light of wavelength 5500 Å and the interference pattern is obtained on a screen 1.5 m from the slits. The least distance of a point from the central maximum where the intensity is minimum is (A) 0.275 mm (B) 0.55 mm (C) 2.75 mm (D) 5.5 mm.
In two separate setups of Young’s double-slit experiment, the wavelengths of the lights used are in the ratio 1 : 2 while the separation between the slits are in the ratio 2 : 1. If the fringe widths are equal, the ratio of the distances between the slit and the screen is (A) 1 : 4 (B) 1 : 2 (C) 2 : 1 (D) 4 : 1.
In Young’s double-slit experiment, the slit separation is reduced to half while the distance of the screen from the slits is increased by 50%. In terms of the initial fringe width, W, the new fringe width is,(A) \(\cfrac14\)W (B) \(\cfrac34\)W (C) \(\cfrac32\)W(D) 3 W
Using a monochromatic light of wavelength 2 in Young’s double-slit experiment, the eleventh dark fringe is obtained on the screen for a phase difference of(A) \(\cfrac{11}2\) π rad (B) \(\cfrac{21}2\) π rad (C) 13 π rad (D) 21 π rad
What is diffraction of light ? Give an example.
Two source S1 and S2 of intensity I1 and I2 are placed in front of a screen [Fig. 10.3 (a)]. The patteren of intensity distribution seen in the central portion is given by Fig. 10.3 (b). In this case which of the following statements are true. (a) S1 and S2 have the same intensities. (b) S1 and S2 have a constant phase difference. (c) S1 and S2 have the same phase. (d) S1 and S2 have the same wavelength.
The resolving power of a telescope of aperture 100 cm, for light of wavelength 5.5 × 10-7 m, is (A) 0.149 × 107 (B) 1.49 × 107(C) 14.9 × 107(D) 149 × 107
Unpolarised light is incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted rays are perpendicular to each other? (For glass refractive index = 1.5).
Unpolarized light is passed through two polarizers. Under what condition is the intensity of the emergent light (i) maximum (ii) zero?
Polarization of light CANNOT be produced by (A) reflection (B) double refraction (C) dichroism(D) diffraction.

Light of wavelength 5000 A falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment