When sunlight is concentrated on a piece...

When sunlight is concentrated on a piece of paper by a spherical mirror or lens, than a hole can be burnt in it. For doing this, the paper must be placed at the focus of:

either a convex mirror or convex lens

either a concave mirror or concave lens

either a concave mirror or convex lens

either a convex mirror or concave lens

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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise

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