Magnification

Physics ⇒ Light and Optics

Magnification starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Magnification. 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 10

A concave mirror forms an image 20 cm behind the mirror when the object is placed 10 cm in front of it. What is the magnification?

A convex lens forms an image 15 cm from the lens when the object is placed 5 cm from the lens. What is the magnification?

A convex mirror forms an image 5 cm behind the mirror when the object is placed 20 cm in front of it. What is the magnification?

A lens forms an image 10 cm high from an object 2 cm high. What is the magnification?

A lens forms an image that is 4 times smaller than the object and erect. What is the magnification?

A lens forms an image that is three times larger than the object and inverted. What is the magnification?

A student observes that the image formed by a lens is upright and larger than the object. What can be said about the magnification?

A student places an object 10 cm from a lens and finds the image is 30 cm from the lens on the opposite side. What is the magnification?

Explain how you can determine the nature of an image (real or virtual) using the sign of magnification.

Explain why the magnification of a plane mirror is always 1.

Explain why the magnification of a virtual image formed by a convex lens is always positive.

If a lens forms an image that is virtual and erect, what can you say about the sign of its magnification?

If an object 4 cm high produces an image 12 cm high, what is the magnification?

If the height of the object is 2 cm and the height of the image is -6 cm, what is the magnification?

If the image distance (v) is 30 cm and the object distance (u) is -10 cm, what is the magnification?

If the image formed by a lens is smaller than the object, what is the range of possible values for magnification?

If the magnification of a lens is 1, what does this tell you about the image?

If the magnification of a mirror is 0.5, what does this indicate about the image?

If the magnification of a mirror is -0.5, what does this indicate about the image?

If the object distance (u) is -20 cm and the image distance (v) is 40 cm, calculate the magnification.