UP Board Class 12 Ray Optics — practice questions
24 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice UP Board Class 12 Ray Optics in the app →A concave mirror of focal length $20$ cm forms a real image at $30$ cm from the pole. The object is at:Light enters a glass slab ($n = 1.5$) from air ($n = 1$) at angle of incidence $30^\circ$. The angle of refracA glass-to-air interface has refractive index ratio $n = 1.5$. The critical angle for total internal reflectioA convex lens has focal length $+10$ cm. A pencil placed $30$ cm from the lens forms an image at:In NCERT's sign convention for spherical mirrors, distances are measuredThe mirror equation relates u, v and f asTotal internal reflection requires light to travel fromFor a thin lens, the focal length is the distance from the optical centre toThe power P of a lens of focal length f (in metres) is given byAn object is placed 30 cm from a concave mirror of focal length 20 cm. The image distance isRefractive index of water with respect to air is 4/3. The critical angle for a water–air interface is approximA convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 25 cm. The power Light passes from air (n=1) into glass (n=1.5) at an incidence angle of 60°. Using Snell's law, the angle of rFor a thin prism of small refracting angle A and refractive index n, the deviation δ is approximatelyAn astronomical telescope in normal adjustment has an objective of focal length 100 cm and an eyepiece of focaAn object is placed 15 cm from a convex lens of focal length 10 cm. The image isThe apparent depth of an object lying at the bottom of a pool of water (n = 4/3) is, in terms of its real deptGlass has refractive index 1.5 with respect to air. A light ray inside the glass strikes the glass–air boundarA compound microscope has an objective of focal length 1.0 cm and an eyepiece of focal length 5.0 cm. With theA converging lens of focal length f is split along its principal axis into two semicircular halves and the halRefraction at a single convex spherical surface: an object in air (n₁ = 1) at distance 20 cm from a glass (n₂ A thin prism of refracting angle 5° is made of glass with n = 1.5. The deviation δ of a light ray passing throA Galilean telescope (objective convex, eyepiece concave) has objective focal length 20 cm and eyepiece focal Two thin convex lenses, each of focal length 20 cm, are placed coaxially 10 cm apart in air. The equivalent fo