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 9
A concave lens of focal length 20 cm forms an image 8 cm from the lens. What is the object distance?
A convex lens forms a diminished, real, and inverted image. Where is the object placed?
A convex lens forms an image that is the same size as the object. Where is the object placed?
A convex lens has a focal length of 20 cm. An object is placed 60 cm from the lens. Calculate the image distance.
A lens forms an image 15 cm from the lens when the object is placed 10 cm from it. If the image is on the same side as the object, what is the focal length?
A lens forms an image that is real, inverted, and the same size as the object. What is the object distance relative to the lens?
A lens forms an image that is virtual, erect, and larger than the object. Which lens is it and where is the object placed?
A student observes that the image formed by a lens is always smaller than the object, regardless of the object's position. What type of lens is it?
A student places an object 15 cm from a convex lens of focal length 10 cm. Calculate the image distance.
A student uses a convex lens to focus sunlight onto a piece of paper. What is the distance between the lens and the paper called?
If a lens has a power of -4 D, what type of lens is it?
If an object is placed at 2F in front of a convex lens, where will the image be formed?
If the focal length of a convex lens is 10 cm, what is its power in diopters?
If the focal length of a lens is negative, what type of lens is it?
If the image formed by a lens is virtual and erect, what can you say about the type of lens and the position of the object?
If the magnification produced by a lens is -2, what does the negative sign indicate?
If the magnification produced by a lens is less than 1, what can you say about the size of the image?
If the object distance (u) is -25 cm and the image distance (v) is +50 cm for a lens, what is the focal length?
If the object is placed at infinity, where is the image formed by a convex lens?
If the object is placed at the focus of a convex lens, what is the nature of the image formed?
