Light - Study Mode
[#281] If an object is placed 10 cm away from a convex mirror of radius of curvature of 5cm what will be its magnification?
Correct Answer
(B) 0.3
[#282] Consider the following phenomena. 1. Size of the Sun at dusk 2. Colour of the Sun at dawn 3. Moon being visible at dawn 4. Twinkle of stars in the sky 5. Polestar being visible in the sky Which of the above are optical illusions?
Correct Answer
(C) Only 1, 2 and 4
[#283] To get a diminished, virtual and erect image of a tall building, which mirror is used?
Correct Answer
(B) Convex mirror
[#284] Where should an object be placed in front of a convex lens in order to obtain its original size?
Correct Answer
(A) 2F 1
[#285] A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
Correct Answer
(C) The lens is convex and has a focal length of 0.5 m