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 12
A lens forms a virtual, erect, and magnified image. What type of lens is it and where is the object placed?
A lens forms an image that is the same size as the object and is real and inverted. Where is the object placed relative to the lens?
A lens forms an image that is three times the size of the object and is real and inverted. What is the magnification and what does it indicate?
A student uses a convex lens to focus sunlight onto a piece of paper. What does the point of brightest light on the paper represent?
Describe the nature and position of the image formed by a concave lens when the object is placed at any position.
A convex lens forms an image 40 cm from the lens when the object is placed 10 cm from it. Calculate the focal length of the lens.
A student places an object 10 cm from a concave lens of focal length 15 cm. Where is the image formed?
A student uses a convex lens to focus sunlight onto a piece of paper. What does the point of brightest light on the paper represent?
A bi-convex lens is made of glass (refractive index 1.5) with radii of curvature of +20 cm and -20 cm. Calculate its focal length using the lens maker's formula.
Which of the following best describes the image formed by a convex lens when the object is at infinity?
(1) Real, inverted, and highly diminished at the focus
(2) Virtual, erect, and magnified at the focus
(3) Real, erect, and same size at the focus
(4) Virtual, inverted, and diminished at the focus
Which of the following is NOT a characteristic of the image formed by a concave lens?
(1) Virtual
(2) Erect
(3) Magnified
(4) Diminished
Which of the following is NOT a use of convex lenses?
(1) Magnifying glass
(2) Camera lens
(3) Spectacles for hypermetropia
(4) Spectacles for myopia
Which of the following is true for the image formed by a convex lens when the object is placed at the focal point?
(1) The image is formed at infinity
(2) The image is formed at the center of curvature
(3) The image is virtual and erect
(4) The image is real and diminished
A concave lens always forms a/an _______ image.
Fill in the blank: The image formed by a convex lens of an object placed between the lens and its focal point is _______.
Fill in the blank: The SI unit of power of a lens is _______.
True or False: A real image can be seen directly by the eye without a screen.
True or False: The focal length of a convex lens is always positive.
True or False: The image formed by a concave lens is always on the same side of the lens as the object.
True or False: The image formed by a convex lens can be either real or virtual depending on the position of the object.
