Light & Optics MCQs with Answers

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An object that absorbs all seven colours of light appears black because no light is reflected back to the eye.

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The speed of light is maximum in space (vacuum), where it travels at approximately 3 × 10⁸ m/s.

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In a concave mirror, the image size depends upon the position of the object relative to the focal point and center of curvature.

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The critical angle for water is 49°.

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When an object is placed at the focus of a convex lens, the image is formed at infinity.

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Resolution of a microscope is defined as the smallest distance between two points at which they can still be distinguished as separate.

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Refractive index is both unitless and dimensionless because it is a ratio of two similar quantities (speed of light in vacuum to speed of light in a medium).

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The bending of light when it passes from one medium to another is called Refraction.

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To observe the position of a microparticle with the greatest accuracy, one must use light of short wavelength.

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A spectroscope is an optical instrument used to measure and analyze the properties of visible light by dispersing it into its component wavelengths (spectrum).