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Sahay Sir > Question Answers > NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions > Physics > Chapter 28 - Electromagnetic Waves > A concave mirror of focal length ′f1′​ is placed at a distance of ′d′ from a convex lens of focal length ′f2′​. A beam of light coming from infinity and falling on this convex lens concave mirror combination returns to infinity. The distance ′d′ must equal

A concave mirror of focal length ′f1′​ is placed at a distance of ′d′ from a convex lens of focal length ′f2′​. A beam of light coming from infinity and falling on this convex lens concave mirror combination returns to infinity. The distance ′d′ must equal

If λv λx and λm represents the wavelength of visible light X-ray and microwave respectively then