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 10
A convex lens has a focal length of 10 cm. An object is placed 30 cm from the lens. Calculate the image distance.
A convex lens has a focal length of 20 cm. What is its power in diopters?
A lens forms an image 10 cm from the lens when the object is placed 20 cm from the lens. If the image is on the same side as the object, what is the focal length?
A lens forms an image that is diminished, virtual, and erect. What type of lens is it most likely to be?
A student observes that the image formed by a lens is larger than the object and is on the same side as the object. What type of lens and object position is this?
A student places an object 5 cm from a concave lens of focal length 10 cm. Where will the image be formed?
Describe the nature and position of the image formed by a convex lens when the object is placed between F and 2F.
Explain the difference between real and virtual images formed by lenses.
Explain why a concave lens always forms a virtual image.
If an object is placed at 2F in front of a convex lens, where will the image be formed?
If the magnification produced by a lens is -2, what does the negative sign indicate?
If the object distance (u) is -15 cm and the image distance (v) is +30 cm for a lens, what is the focal length?
State the lens formula relating object distance (u), image distance (v), and focal length (f).
State the sign convention for the focal length of a concave lens.
What is the nature of the image formed by a convex lens when the object is placed between the optical center and the focus?
A concave lens of focal length 12 cm forms an image 8 cm from the lens. Calculate the object distance.
A convex lens is used to project an image of a candle onto a screen. If the image is sharp and inverted, what can you say about the nature of the image and the position of the object relative to the lens?
A lens forms an image that is real, inverted, and smaller than the object. Which type of lens is it, and where is the object placed relative to the lens?
An object 4 cm high is placed 15 cm in front of a convex lens of focal length 10 cm. Calculate the height and nature (real or virtual, erect or inverted) of the image formed.
Explain why the image formed by a concave lens is always smaller than the object, regardless of the object's position.
