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 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?
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.
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 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 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?
Which of the following best describes the image formed by a convex lens when the object is at the focus (F)? (1) Real, inverted, at infinity (2) Virtual, erect, at infinity (3) Real, erect, at 2F (4) Virtual, inverted, at F
Which of the following is a converging lens? (1) Concave lens (2) Convex lens (3) Plano-concave lens (4) Biconcave lens
Which of the following is NOT a property of the image formed by a plane mirror? (1) Virtual (2) Erect (3) Same size as object (4) Inverted
Which of the following is NOT a use of convex lenses? (1) Magnifying glass (2) Camera lens (3) Spectacles for myopia (4) Projector lens
Fill in the blank: The image formed by a concave lens is always ________ and ________.
Fill in the blank: The power of a lens (in diopters) is the reciprocal of its ________ (in meters).
The distance between the optical center of a lens and its principal focus is called the ________.
The magnification produced by a lens is given by the ratio ________ / ________.
True or False: A real image formed by a lens can be projected onto a screen.
True or False: The image formed by a convex lens can be both real and virtual depending on the position of the object.
Yes or No: Can a concave lens form a real image?
Yes or No: Can a convex lens form a virtual image?
