122 past-paper questions on Ray Optics and Optical Instruments from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 41-60 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Derive the following.
To show: $n = \frac{\sin\left(\frac{A + \delta_m}{2}\right)}{\sin\left(\frac{A}{2}\right)}$
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| Lens | Aperture (cm) | Power (D) |
|---|---|---|
| $L_1$ | 8 | 3 |
| $L_2$ | 1 | 10 |
| $L_3$ | 1 | 6 |
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Answer the following.
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Assertion: When a convex lens made of glass is completely immersed in water, its focal length increases.
Reason: Refractive index of glass with respect to water is greater than that of glass with respect to air.
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Assertion: When a beam of white light is passed through a prism, it gets split into its constituent colours.
Reason: Refractive index of glass is different for different wavelengths of light.
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Assertion: If critical angle of glass-air pair ($\mu_g = 3/2$) is $\theta_1$ and that of water-air pair ($\mu_w = 4/3$) is $\theta_2$, then the critical angle for the water-glass pair will lie between $\theta_1$ and $\theta_2$.
Reason: A medium is optically denser if its refractive index is greater.
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Solve the following.
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Assertion: The graph for 'v' versus 'u' of a concave mirror forming real images, falls within the second quadrant.
Reason: For concave mirrors, according to the sign convention for real images, 'u' is negative, and 'v' is positive.
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Answer in one word.
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