List of top Science Questions on Optics asked in UP Board X

Which lens should be used to form an apparent and enlarged image of an object?
The reason for the blue colour of the sky is:
At what distance should an object be placed from a concave mirror of focal length 10 cm, so that a real image 5 times larger is formed? Also, find the position of the image.
The focal length of a convex lens is 50 cm. State the position of the image of an object placed at a distance of 25 cm, perpendicularly on its axis. Also, determine the magnification of the image.
The magnification of the virtual image of an object placed at a distance of 0.2 m from the lens is 0.5. The lens will be:
On placing a concave lens in the path of convergent rays, they focus on the axis in the back, 20 cm from the lens.
In the absence of a lens, where do the rays focus? The focal length of the lens is 30 cm.
The focal length of a convex lens is 15 cm. The image of an object placed 30 cm away from the lens will be: