Class-X Light, Reflection and Refraction.

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Class-X Light, Reflection and Refraction. Science Question bank Class-X Light, Reflection and Refraction. One word answer type questions 1. Which form of energy enables us to see our surroundings? 2. What is the angle of incidence if the angle of reflection is 45◦? 3. Which mirror is used for rear view in the vehicles? 4. Where the image will be formed for a convex lens if an object is placed at focus? 5. What we call the line passing through focus and pole of a mirror?

Fill in the blanks type: 6.__________mirror is used by a dentist to see the large image of tooth 7. The power of lens is measured in_________ . 8. The ratio of sine of angle of incidence to the sine of angle of refraction is called________. 9. _______ lens has negative power. 10._______ mirror always forms erect image. True/false type question: 11. A ray of light can travel through an opaque medium. 12. A plane mirror always forms a real image. 13. The ratio of size of image to the size of object is known as magnification. 14. When a ray travels from denser to rarer medium then it bends towards the normal. 15. The image formed by concave lens is in the same side that of object

MCQ type: 16. For normal incidence, the angle of reflection is a. 0 ◦ b. 45 ◦ c. 90 ◦ d. 180 ◦ 17. The focal length is taken as negative for a. convex mirror, convex lens b. concave mirror, concave lens c. convex mirror, concave lens d. concave mirror, convex lens 18. Image formed by plane mirror is a. virtual and erect b. laterally inverted c. of same size that of object d. all of above 19. Convex mirror is used for rear view because a. it always forms real image b. it always forms virtual image c. image forms in front of mirror d. image formed is large in size 20. The relation between focal length (f), object distance (u), image distance (v) for a lens is a. 1/v-1/u=1/f b. 1/v+1/u=1/f c. 1/u-1/v=1/f d. 1/f-1/u=1/v

21. Match the column for convex lens: Position of object Position of the image At infinity Between f2 and 2f2 At 2f1 Beyond 2f2 Beyond 2f1 At f2 Between f1and O At f1 Same side that of object Between f1 and 2f1 At 2f2

Numerical problems: 22. Calculate the angle of reflection for the given ray diagram 23. For a concave mirror the focal length is 12 cm. calculate the diameter of that sphere of which the given mirror is a part. 24. Draw a ray diagram for spherical mirror having m=1 for real image. 25. The magnification produced by a mirror is 4 for both type of images in two different cases. If the radius of curvature of mirror is 40 cm. calculate the object distance and image distance for both the cases.