### In this article,you students can Light ,Reflection and Refraction Previous year Questions which will score you more in your board exam 2020.

#### Knowledge of physics gained through theories and Science practicals for Class 10  Physics can be a stepping stone towards great career profiles such as a physicist or an inventor. Even if you do not want to pursue a career related to Physics, the concepts learned through your  Class 10 Physics chapters can make you a smarter person.

1."The magnification produced by a spherical mirror is -3." List four informations you obtain from thisstatement about the mirror/image.

2.What is meant by power of a lens? What does its sign (+ve or -ve) indicate? State its SI unit. How is this unit related to focal length of a lens?

3.Name the type of mirror used in a solar furnace. How is high temperature achieved by this device?

4.An object is placed at  2F in front of a concave mirror. What is the
(i) position
(ii) size
(iii) nature of image?

5.An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm, determine the position, nature and size of the image formed using the lens formula.

6.A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror.

(i) Write the type of mirror
(ii) Find the distance of the image from the object.
(iii) What is the focal length of the mirror?
(iv) Draw the ray diagram to show the image
formation in this case.

7.A student wants to project the image of a candle flame on the walls of the school
laboratory by using a mirror.

(i) Which type of mirror should he use and why?

(ii) At what distance, in terms of focal length F of the mirror, should he place the candle flame to get the magnified image on the wall?

(iii) Draw a ray diagram to show the formation of the image in this case.

(iv) Can he use this mirror to project a diminished image of the candle flame on the same wall? State 'how', if your answer is 'yes' and 'why not', if your answer is 'no'.

8.The radius of curvature of a concave mirror is 50 cm. Where should an object be placed from the mirror, so as to form its image at infinity? Justify your answer.

9.Two converging lenses having focal lengths 20cm and 40cm are joined together .
Find  power of these combination.