Free Optics MCQs with Answers
665 Optics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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665 questions · page 34 of 34
- A. The slit width should be increased
- B. The slit width should be decreased
- C. The slit separation should be increased
- D. The slit separation should be decreased
Explanation: The correct answer is to decrease the slit separation. In a diffraction grating, narrower slit separation results in larger angular…
Correct answer: The slit separation should be decreased- A. Its wave length decreases
- B. Its wave length in creases
- C. Its frequency increases
- D. Its frequency decreases
Explanation: As the medium is dense, the speed decreases. The frequency has to remain constant therefore the wavelength decreases ( v = fλ)
Correct answer: Its wave length decreases- A. 3
- B. 4
- C. 5
- D. 1
Explanation: Explanation is given below.The formula for the number of images formed by a diffraction grating is:nλ = d(sinθ + sinφ)where n is the order…
Correct answer: 3- A. Reflection of light
- B. Division of wavelenght
- C. Refraction of light
- D. Division of amplitude
Explanation: The principle of thin film interference is based on the division of wavelengths of light.
Correct answer: Division of wavelenght- A. Critical angle
- B. At any angle, both rays are perpendicular
- C. Brewster's angle
- D. Inclination angle
Explanation: Brewster's angle is the angle of incidence at which the reflected and refracted rays are perpendicular to each other.
Correct answer: Brewster's angle