CBSE Class 10 class10_light_lenses — practice questions
17 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 10 class10_light_lenses in the app →Refractive index n of a medium is defined as:Power P of a lens is defined as:The absolute refractive index of a medium is simply called its:The refractive index of water is:A lens thicker at the middle than at the edges is called:A convex lens is also known as a:A lens thicker at the edges than at the middle is called:A concave lens spreads light rays and so is said to:How many spherical surfaces does a lens have?The centres of the spheres forming a lens are called centres of:The power of a lens is defined as the reciprocal of its:The power of a lens is represented by which letter?The SI unit of the power of a lens is the:One dioptre is the power of a lens whose focal length is:The power of a convex lens is:The power of a concave lens is:Who prescribes corrective lenses by stating their powers?