what are the important numericals in physics for tomorrow's board exam please help me to give the exam
Answers
Q-1 : Far point of a myopic person is 40cm. what type of lens should he wear so as to see the distant objects clearly? Calculate the focal length and the power of the lens he should use.
Q-2 : The focal length of a concave mirror is 30 cm. Find the position of the object in front of the mirror so that the image is three times the size of the object.
Q-3 : A converging lens has focal length of 12 cm. Calculate at what distance should the object be placed from the lens so that it forms an image at 48 cm on the other side of the lens.
Q-4 : An object is placed 15 cm from a convex mirror of radius of curvature 60 cm. Find the position if image and its magnification.
Q-5 : An object , 4.0 cm in size , is placed 25.0 cm in front of a concavee mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and the size of the image.