Optics — Practice Quiz
Maharashtra Board · Class 11 · Physics
Try a 4-question quiz on Optics for Maharashtra Board Class 11 Physics: tap an answer to check it and see why. 45 questions in the full chapter test.
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Quick Quiz: Optics
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What is the speed of light in vacuum?
A concave mirror has a radius of curvature of 20 cm. What is its focal length?
An object is placed 30 cm in front of a convex lens of focal length 20 cm. Calculate the image distance.
What is the refractive index of a medium if light travels at 2 × 10⁸ m/s in it?
Sample Questions
Which of the following are correct about total internal reflection? (Select all correct)
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It occurs when light travels from denser to rarer medium, The angle of incidence must be greater than critical angle, It is used in optical fibers
Total internal reflection occurs when: (1) Light travels from optically denser to rarer medium, (2) Angle of incidence ≥ critical angle, (3) No refraction occurs - all light is reflected. It's the principle behind optical fiber communication.
In a compound microscope, which lens produces the first magnified image?
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Objective lens
In a compound microscope, the objective lens (closer to the object) produces the first real, inverted, and magnified image. This image then acts as an object for the eye lens, which produces the final virtual and magnified image.
The critical angle for total internal reflection at a glass-air interface is 42°. What is the refractive index of glass?
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1.49
At critical angle, sin(ic) = 1/n, where n is refractive index of denser medium. Given ic = 42°, so n = 1/sin(42°) = 1/0.669 = 1.49
Which of the following statements about dispersion are correct? (Select all correct)
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Violet light has higher refractive index than red light, Dispersion occurs because refractive index depends on wavelength, White light separates into constituent colors
Dispersion occurs because refractive index increases with frequency (decreases with wavelength). Violet has highest frequency, so highest refractive index and maximum deviation. Red has lowest frequency, so lowest refractive index and minimum deviation.
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