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#	Question	Subject and topic	Difficulty
4981	An object is placed 20 cm in front of a concave mirror of focal length 15 cm. Where is the image and what is …	Physics Reflection by spherical mirrors	Medium
4982	An object is placed 20 cm in front of a convex mirror of radius of curvature 40 cm. Where is the image?	Physics Reflection by spherical mirrors	Medium
4983	A person stands 10 cm from a concave shaving mirror of focal length 15 cm. Which description of the image is …	Physics Reflection by spherical mirrors	Hard
4984	The working of an optical fibre is based on:	Physics Refraction and total internal reflection	Easy
4985	A water tank is 12 cm deep. Viewed from directly above, how deep does it appear? (Refractive index of water =…	Physics Refraction and total internal reflection	Easy
4986	What is the critical angle for light going from a medium of refractive index √2 into air?	Physics Refraction and total internal reflection	Medium
4987	Diamond sparkles more than glass cut to the same shape mainly because diamond has:	Physics Refraction and total internal reflection	Medium
4988	A point object in air is 30 cm from the convex surface of a large glass block (n = 1.5). The radius of curvat…	Physics Refraction and total internal reflection	Hard
4989	What is the power of a concave lens of focal length 25 cm?	Physics Lenses	Easy
4990	An object is placed 30 cm in front of a convex lens of focal length 20 cm. What are the image distance and ma…	Physics Lenses	Medium
4991	An equiconvex glass lens (n = 1.5) has both radii of curvature equal to 20 cm. What is its focal length?	Physics Lenses	Medium
4992	Two thin lenses of power +5 D and –3 D are placed in contact. What is the focal length of the combination?	Physics Lenses	Medium
4993	A glass convex lens (n = 1.5) has a focal length of 20 cm in air. What is its focal length when fully immerse…	Physics Lenses	Hard
4994	A thin prism of angle 5° is made of glass of refractive index 1.5. What is its deviation of a ray?	Physics Prism	Easy
4995	When white light passes through a glass prism, which colour is deviated the most?	Physics Prism	Easy
4996	An equilateral glass prism gives a minimum deviation of 30°. What is the refractive index of the glass?	Physics Prism	Medium
4997	A ray passes through an equilateral prism at minimum deviation. What is the angle of refraction at the first …	Physics Prism	Medium
4998	A thin prism of angle 6° has refractive indices 1.66 for violet and 1.64 for red. What is the angular dispers…	Physics Prism	Hard
4999	Why does the objective of an astronomical telescope have a large aperture?	Physics Optical instruments	Easy
5000	A convex lens of focal length 5 cm is used as a simple microscope with the image formed at the near point (25…	Physics Optical instruments	Easy