ICSE Class 10 Refraction through a Lens — practice questions
30 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice ICSE Class 10 Refraction through a Lens in the app →A convex lens is also called a:The focal length of a concave lens is taken to be:Power of a lens has the SI unit:An object placed at 2F from a convex lens forms an image:A concave lens always forms an image that is:Power of a convex lens of focal length 50 cm is:Magnification produced by a lens is given by:An object placed at the focal point of a convex lens produces image:For a convex lens, when the object is between F and 2F, the image is:A convex lens is used as a magnifying glass. The object is placed:Image distance v = +30 cm and object distance u = -10 cm. Magnification is:An object 4 cm tall is placed 12 cm from a convex lens of focal length 8 cm. The image is:Two thin lenses of focal lengths +20 cm and +25 cm are placed in contact. Power of combination:Sign convention for distances in a lens experiment takes:A magnifying glass works best when the object is at:If a convex lens is half covered with black paper, the image formed is:A lens is held in water. Its focal length compared with that in air:A real image of magnification 2 is formed by a convex lens of focal length 10 cm. Object distance is:Power of a concave lens is:An equiconvex thin lens has both surfaces of curvature 20 cm and refractive index 1.5. Its focal length is:A real image of an object can be formed by:If the focal length of a convex lens is doubled, its power:Which is the principal use of a concave lens?An object is placed beyond 2F from a convex lens. Image position is:If both surfaces of a thin lens have equal radii of curvature R, the lens is called:Image formed by a convex lens with object at infinity is:A virtual image:Two lenses of powers +3 D and -5 D are placed in contact. The combination:Cross-section of a convex lens looks like:Linear magnification produced by a converging lens for an object at 2F is: