| - ~ He umage forme jffrractice Questions i Aconcave mirror has a focal length of Be cag leet aa 1 em. What i ts i keeping the candle flame ata digas t 4 SMe Name gn ne UMAUEE? Ans. 20 @ Which type of mirror shouta qhens2) Homie pole” 80 i front ofa mirror by (i) Find the magnification of the im, Student use? (ii) Find the distance between the =e Produced, (iv) Draw a ray diagram to show then ont image. the object and its image. the image formation in this case and mark the dis be . distance between {CBSE (F) 2015) {CBSE (AI) 2015} ince of 10 cm from a concave mirror which produces a 4, An object 3 cm high is placed ata dista virtual image of length 4.5 cm. (i) What is the magnification produced? (ii) 1s magnification negative or positive? (iii) What are the values of u and v for the mirror? (iv) Whatis the focal length of the mirror? (v) Draw a ray diagram for image formation. (vi) What is the nature of the image formed? [Ans. (i) +1.5 (ii) Positive (i) w= -10 cm, v =+ 15 cm (ju) f = -30 em (ui) Eree istance of 5 cm in front of a convex mirror of focal length 10 cm. Calculat naye;ynification of the image and state its nature, [Ans. 3.3 cm behind the mirror; virtual and erec era 5. An object is kepta the position ana convex mirror of focal length 5 cm (i) Draw a ray diagram showing the formation of image (ii) State two characteristics of the image formed. | (ii) Calculate the distance of the image from the mirror. | [Ans. (i) virtual and erect; diminished (jj) 5 0 6. An object is placed at a distance of 10 cm fro 7. An object placed 20 cm in front of a mirror is found to have an image 15 cm () in fron, of, (ii) behind the mirror. Find the focal length of the mirror and the kind of mirror in each «4. 60 ve or G al [Ans. (i) concave mirror of focal length > em, (i) convex mirror of focal length gy om 8. An object is placed at a distance of 10 cm from a coneave mirror of focal length 20 cm () Draw a ray diagram for the formation of image. (ii) Calculate the image d nce, (iii) State two characteristics of the image formed. (Ans. (ii) 20 cm; (ii) virtual and erect; magnitgy 9. What is the position of an image formed when an object is placed at a distance of 20 cm fron, concave mirror of focal length 20 cm? (Ans. Ininig) 10. If an object of height 10 cm is placed at a distance of 36 cm from a concave mirror of focal lengi, 12 cm, find the position, nature and height of the image.[Ans. -18 cm; real and inverte Sen) I. An arrow 2.5 cm high is placed at a distance of 25 cm from a diverging mirror of focal lengh 20 cm. Find the nature, position and size of the image formed. (Ans. .2. Ina convex mirror, when the object is kept at a distance of 30 cm from the mirror, the image's formed at a distance of 10 cm from the mirror. What will be the change in the image distancei the object distance is doubled? [Ans. 2 cm increase) 11.1 em; virtual and erect; 1.1 emai) 3. Acconcave mirror produces a real image of height 2 cm of an object of height 0.5 cm placed Ica away from the mirror. Find the position of the image and the focal length. [Ans. v = — 40 cm, f =-8a0 4. An object is placed in front of a concave mirror of focal length 10 cm, Where should a screente placed to obtain an image double the size of object? [Ans. - 30.0] Aconcave mirror of focal length 12 cm forms double the image of an object. Find out the positio™ of object when such a thing is possible, [Ans. — 18 cm and-6) 3. ‘The image of an object formed by a mirror is real, inverted and is of magnification -1- Ife image is at the distance of 30 cm from the mirror, where is the object placed? Find the position! the image if the object is now moved 20 cm towards the mirror. What is the nature of the ims obtainsd? ).stfy your answer with the help of ray diagram, [CBSE Sample Poper 20! [Ans. wv 30cm, v' = + 30cm. Image formed is virtual, erect and magnilieAn object 2 cm high is placed at a distance of 32 cm from a concave mirror, The image is real, inverted and 3 cm in size. Find the focal length of the mirror and the position where the image is formed? [CBSE Sample Paper 2016)E An object 3 cm in size is placed at 20 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and size of the image.