Q1. Q.3. Q4, Q5. Q6. Q7. Lt An object 5 cm high is located 20 cm from a concave mirror, whose focal length is 25 cm. Make an accurate scale diagram and hence locate the position of the image and find its size. Also, state the nature of the image. A ray of light strikes a plane mirror at an angle of 20° with the mirror. What is the angle of incidence and angle of reflection? By what angle the incident ray has suffered deviation ? A concave mirror has’a focal length of 40 cm. Determine the object position for which the resulting image will be erect and four times the size of the object. (Ans. 30 cm) A convex mirror has a focal length of 20 cm. Determine an object location for which the image will be one-half the size of the object. (Ans. 20 cm) A concave mirror has a'radius of ‘curvature of 60 cm. Calculate the image position and magnification of an object placed in front of the mirror at distances of (a) 90 cm and (b) 20 cm. (c) Draw ray diagrams to obtain the image in each case. _ (Ans. 45 cm,.0.5 and 60 cm, 3) The real-image height of a concave mirror is observed to be four times larger than the object height when the object is 30-cm in front of the mirror. (2) What is the radius of curvature of the mirror ? (b) Use a ray diagram to locate the image position corresponding to the given object position and the radius of curvature calculated in (a). (Ans. 48 cm) Calculate the image position and magnification for an object placed (a) 20 cm and (b) 60 cm in front of a convex mirror of focal length 40 cm. (c) Use ray diagrams to locate image Positions corresponding to the object positions in (a) and (b). (Ans. 13.3 cm, 0.667 and 24 cm, 0.4)L AYOURSELT : | Q.9. Q10. Qu. Q.12. Q.13. Q.14, Q.15. A candle is 49 cm in front of a convex spher; | mirror, of radius of curvature 70 cm. (a) What! { * i ae ere the image? (b) What is the magnification? ‘J ; a (Ans. 0.204 , 0.417 exec | An object 2 cm high is placed 10 cm in front of 3 | mirror. What type of mirror and what radius se | curvature is needed for an upright image that jg 4cmhigh? (Ans. 40 cm) Aspherical mirror is to be used to form an image five times the size of an object on a screen located 5 m from the object. (a) Describe the type of mirror required. (b) Where should the mirror be positioned relative to the object? | (Ans. 2.08 m, concave) | Areal object is located at the zero end of a meter stick. A concave mirror located at the 100 cm end of the meter stick forms an image of the object at | the 70 cm position. A convex mirror placed at the | 60 cm position forms a final image at the | 10cm point. Whatis the radius of curvature of the convex mirror? (Ans. 25 cm) A spherical convex mirtor has a radius of 40 cm. | Determine the position of the virtual image and | magnification of the mirror for object distances of (@ 30 cm and (6) 60 cm. (c) Are the images erect or inverted? (Ans. 12 cm, 0.4 and 15 cm , 0. 25, the images are erect) . An object is 15 cm from the surface of a reflective spherical Christmas-tree ornament 6 cm in diameter. What are the magnification and position of the image? (Ans, 15/11 cm and 1) Express the power of a concave lens of focal lengt! 20 cm with its sign. d A converging lens of focal length 12 cm is plac’ 8 cm in front of a newspaper. Find the (a) image distance and (b) the magnification.