Light Travels In A Straight Line: Activity |Pinhole Camera|OMR

Light travels as a

Light travels in a straight line because

Introduction|Light Travels In A Straigth Line|Image Forming By Plane Mirror|Spherical Mirror|Dispersion Of Light|OMR

Light appears to travel in straight lines since

Light travels in a straight line. This principle is illustrated in a pinhole camera. In this simple device the image of an object is formed on a photographic plate by light passing through a small hole. In one experiment, 5 cm high image of a tree was obtained on a photo plate placed at a distance of 15 cm from the pin hole. Actual height of the tree is 20 m. (a) Find the distance of the pinhole from the tree. (b) How is the size of image affected if the photo plate is moved away from the pinhole? (c) What will happen if a large hole is made in place of a pin hole?

Light travels along a straight line path in a transparent medium. True/false

Light travels in a straight line path while passing through different media.