Image Formation by Lenses
Physics ⇒ Light and Optics
Image Formation by Lenses starts at 8 and continues till grade 12.
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See sample questions for grade 11
A lens forms an image 15 cm from the lens when the object is 10 cm from the lens. What is the magnification produced by the lens?
A lens has a focal length of -20 cm. What type of lens is it?
A student places an object 5 cm from a concave lens of focal length 10 cm. Where will the image be formed?
A student uses a convex lens to project an image of a candle on a screen. The image is inverted and smaller than the candle. Where is the candle placed relative to the lens?
An object is placed 10 cm from a convex lens of focal length 15 cm. Where is the image formed?
Calculate the image distance if an object is placed 30 cm from a convex lens of focal length 10 cm.
Describe the image formed by a convex lens when the object is placed at a distance less than the focal length.
Describe the nature, position, and size of the image formed by a convex lens when the object is placed between F and the optical center.
Explain why a concave lens cannot form a real image of a real object.
If the magnification produced by a lens is +2, what does the positive sign indicate?
If the object distance (u) is -12 cm and the image distance (v) is +24 cm for a lens, calculate the focal length.
If the power of a lens is +5 D, what is its focal length in meters?
State the sign convention for the focal length of a concave lens.
