Q.2.An object is placed at a distance of 10cm from a convex mirror of focal length of 15cm . Find the position and nature of the image
Solution: Given : f = +15cm u = -10cm v = ?’
Q.3.A concave lens of focal length 15 cm , forms an image 10 cm from the lens. How far is the object
Solution : Given: F = -15cm V = -10cm U = ?
Q.4. An object 5.0cm in length is pl aced at a distance of 20cm in front of a convex mirror of radius of Curvature 30cm . F ind the position of the image , its nature and size.
Answer: The change in atmospheric density results in refraction of the light from the sun, bending it toward the earth.
Consequently, the sun can be seen even after it is just below the horizon. Also, the light from lower portion of the sun is refracted more than that from the upper portion, so the lower part appears to be slightly higher in the sky. The effect is an apparent flattening of the disk into an ellipse.
Answer: The layer of water greatly reduces the light reflected back from the car’s headlights, but increases the light reflected by the road of light from the headlights of oncoming cars.
Links For CBSE Class X Science Term-II