Light: Reflection and Refraction (Class 10, NCERT/CBSE syllabus):
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🔹 HOTS Questions
1. A convex lens is used as a magnifying glass. Explain why the object must always be placed between the lens and its focus. What will happen if the object is placed beyond the focus?
2. Two spherical mirrors of different focal lengths are available. Without marking any measurement on them, how will you identify which one is a concave mirror and which one is convex? Justify your answer.
3. A ray of light passes from air into a glass slab and then emerges back into air. If the emergent ray is parallel to the incident ray, explain why the light ray still undergoes deviation.
4. The refractive index of diamond is about 2.42, while that of water is 1.33. Why does diamond sparkle much more than water, even though both obey the laws of refraction?
5. A student tries to obtain the image of a candle flame on a screen using a convex lens. Sometimes he gets a clear sharp image, and sometimes a blurred image. Analyze the possible reasons and suggest corrective measures.
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