subject

Image Formation by Lenses

Physics ⇒ Light and Optics

Image Formation by Lenses starts at 8 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Image Formation by Lenses. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 8
A lens forms an image that is the same size as the object. Where is the object placed relative to a convex lens?
A lens has a focal length of 20 cm. What is its power in diopters?
A student observes that the image formed by a lens is upside down and can be projected on a screen. What type of image is this?
A student places an object 15 cm from a convex lens of focal length 10 cm. Will the image be real or virtual?
A student places an object 5 cm from a convex lens of focal length 10 cm. What is the nature of the image formed?
A student uses a convex lens to focus sunlight onto a piece of paper. What property of the lens is being demonstrated?
If a lens forms an image that is virtual, erect, and larger than the object, where is the object placed?
If an object is placed at infinity in front of a convex lens, where is the image formed?
If the focal length of a lens is 10 cm, what is the distance between the optical center and the principal focus?
If the focal length of a lens is negative, what type of lens is it?
If the image formed by a lens is always virtual, which type of lens is it?
If the object distance (u) is -30 cm and the image distance (v) is 60 cm, what is the focal length (f) of the lens?
If the power of a lens is -2 diopters, what is its focal length?
What is the formula for magnification (m) produced by a lens in terms of image distance (v) and object distance (u)?
What is the nature of the image formed by a convex lens when the object is placed between F and 2F?
What is the sign convention for the object distance in the lens formula?
What type of image is formed by a concave lens for a real object placed anywhere in front of it?
Which type of lens is thicker at the edges than at the center?
A convex lens has a focal length of 25 cm. What is its power in diopters?
A student observes that the image formed by a lens is virtual, erect, and smaller than the object. Which type of lens is being used and where is the image located relative to the lens?