21. Two convex lenses with power 2 D are kept in contact with each other. The focal length of the combined lens system is
22. Image formed by the plane mirror is
23. Twinkling of stars is due to
24. Find the position of the image formed by a concave mirror when the object is placed between P and F?
25. The focal length of a convex lens is 50 cm. Calculate its power.
26. The transverse nature of light waves is confirmed by
27. What is the unit of refractive index?
28. The part of the eye having the large refractive index is
29. The refractive index of fused quartz is 1.46 and that of sapphire is 1.77. If Vq is the speed of light in quartz and Vs is the speed of light in sapphire, then which one of the following relations is correct?
30. When an object is placed between C and F, where will the image form in a concave mirror?
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