alleryStart learning →Olympiad (Class 10) Light — practice questions
13 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Olympiad (Class 10) Light in the app →Two lenses of power +5 D and −2 D are placed in contact. The focal length of the combination isA 10 mm pin in front of a concave mirror forms a real, inverted 5 mm image at 30 cm in front of the mirror. ThThe refractive index of a medium is 1.5. The speed of light in that medium is (c = 3×10⁸ m/s)The magnification produced by a plane mirror isA convex lens has power +4 D. Its focal length isAn object is placed at the centre of curvature of a concave mirror. The image formed isA convex lens forms a real image three times the size of the object on a screen. If the focal length is 20 cm,The laws of reflection hold good forA ray of light travelling in air enters water (n = 4/3). It bendsAn object 4 cm tall is placed 15 cm from a convex lens of focal length 10 cm. The image height isA small bulb is placed at the focus of a concave mirror of focal length 12 cm. The reflected beam isThe power of a lens is −2.5 D. The lens isFor a concave mirror, as an object moves from infinity towards the focus, the real image