Light propagates rectilinearly because of its
Options
(a) Frequency (b) Wavelength (c) Velocity (d) Wave nature
Correct Answer:
Wavelength
Explanation:
Wavelength of light is very small. It is of the order of 6000 Å […]
If light emitted from sodium bulb is passed through sodium vapour, then we can get from emergent light
Options
(a) One line of 5890 Å (b) One line of 5896 Å (c) Both […]
180⁰ phase difference is obtained when light ray is reflected from
Options
(a) Air to glass (b) Glass to air (c) Diamond to glass (d) Glass to water
Correct Answer:
Air to glass
What is the time taken by moon light to reach earth?
Options
(a) 8 sec (b) 10 sec (c) 9 sec (d) None of these
Correct Answer:
None of these
Explanation:
Distance between earth […]
Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
Options
(a) 4×10⁻¹¹ sec (b) 2×10⁻¹¹ sec (c) 16×10⁻¹¹ sec (d) 8×10⁻¹¹ sec
Correct Answer:
4×10⁻¹¹ […]
An interference pattern was made by using red light. If the red light is replaced by blue light, the fringes will becomes
Options
(a) Wider (b) Narrower (c) Fainter (d) Brighter
Correct Answer:
Narrower
Laser beams are used to measure long distance because
Options
(a) they are monochromatic (b) they are highly polarised (c) they are coherent (d) they have high degree of parallelism
Correct Answer:
they […]
The dual nature of light is exhibited by
Options
(a) Photoelectric effect (b) Refraction and interference (c) Diffraction and reflection (d) Diffraction and photoelectric effect
Correct Answer:
Diffraction and photoelectric effect
Explanation:
Diffraction exhibits […]
Coherent sources are those sources for which
Options
(a) Phase difference remains constant (b) Frequency remains constant (c) Both phase difference and frequency remain constant (d) None of these
Correct Answer:
Both phase […]
Newton postulated his corpuscular theory on the basis of
Options
(a) Newton’s Rings (b) Colours of thin films (c) Rectilinear propagation of light (d) Dispersion of white light
Correct Answer:
Rectilinear propagation of light
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