Chapter 18 – Refraction at Spherical Surfaces
Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 18 - Refraction at Spherical Surfaces
The image of a square hole in a screen illuminated by light is obtained on another screen with the help of a converging lens. The distance of the hole from the lens is 40 cm. If the area of the image is nine times that of the hole, the focal length of the lens is :
17
Nov
The image of a square hole in a screen illuminated by light is obtained on another screen with the help of a converging lens. The distance of the hole from the lens is 40 cm. If the area of the image is nine times that of the hole, the focal length of the lens is [...]
The distance between two point object P and Q is 32 cm, a convex lens of focal length 15 cm is placed between them so that the images of both the objects are formed at the same place. The distance of P from the lens could be
17
Nov
The distance between two point object P and Q is 32 cm, a convex lens of focal length 15 cm is placed between them so that the images of both the objects are formed at the same place. The distance of P from the lens could be a convex lens of focal length 15 cm [...]
When an object is moved along the axis is of a lens images three times the size, of the object are obtained when the object is at 16 cm and at 8 cm respectively from the lens. The focal length and nature of the lens are
17
Nov
When an object is moved along the axis is of a lens images three times the size, of the object are obtained when the object is at 16 cm and at 8 cm respectively from the lens. The focal length and nature of the lens are of the object are obtained when the object is [...]
The distance between an object and its real image formed by a lens is D. If the magnification is m, the focal length of the lens is
17
Nov
The distance between an object and its real image formed by a lens is D. If the magnification is m, the focal length of the lens is The distance between an object and its real image formed by a lens is D. If the magnification is m the focal length of the lens is November [...]
The focal length of convex tens is f and the distance of an object from the principal focus is x. The ratio of the size of the real image to the size of the object is
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Nov
The focal length of convex tens is f and the distance of an object from the principal focus is x. The ratio of the size of the real image to the size of the object is The focal length of convex tens is f and the distance of an object from the principal focus is [...]
An object is placed first at infinity and then at 20 cm from the object side focal plane of a convex lens. The two images thus formed are 5 cm apart the focal length of the lens is
17
Nov
An object is placed first at infinity and then at 20 cm from the object side focal plane of a convex lens. The two images thus formed are 5 cm apart the focal length of the lens is An object is placed first at infinity and then at 20 cm from the object side focal [...]
In previous question, the nature and size of the image are
17
Nov
In previous question, the nature and size of the image are In previous question the nature and size of the image are November 17, 2020 Category: Cengage NEET by C.P Singh , Chapter 18 - Refraction at Spherical Surfaces , Part 2 ,
A needle of height 5 cm placed 45 cm from a lens forms an image on a screen placed 90 cm on the other side of the lens. The type of lens and its focal length are
17
Nov
A needle of height 5 cm placed 45 cm from a lens forms an image on a screen placed 90 cm on the other side of the lens. The type of lens and its focal length are A needle of height 5 cm placed 45 cm from a lens forms an image on a screen [...]
An object 1.5 cm high is placed 10 cm from the optical centre of a thin lens. Its image is formed 25 cm from the optical centre on the same side of the lens as the object. The height of the image is
17
Nov
An object 1.5 cm high is placed 10 cm from the optical centre of a thin lens. Its image is formed 25 cm from the optical centre on the same side of the lens as the object. The height of the image is An object 1.5 cm high is placed 10 cm from the optical [...]
A convex lens of focal length 16 cm forms a real image double the size of the object. The distance of the object from the lens is
17
Nov
A convex lens of focal length 16 cm forms a real image double the size of the object. The distance of the object from the lens is A convex lens of focal length 16 cm forms a real image double the size of the object. The distance of the object from the lens is November [...]