Chapter 18 – Refraction at Spherical Surfaces
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Two similar plano – convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be
17
Nov
Two similar plano – convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be Two similar plano - convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths [...]
Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 25 cm and 20 cm. They are placed in contact with their curved surface towards each other and the space between them is filled with liquid of refractive index 4/3. Then the combination is
17
Nov
Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 25 cm and 20 cm. They are placed in contact with their curved surface towards each other and the space between them is filled with liquid of refractive index 4/3. Then the combination is A convex lens of glass [...]
A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 3/2. Their equivalent focal length is 30 cm. What are their individual focal lengths in cm
17
Nov
A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 3/2. Their equivalent focal length is 30 cm. What are their individual focal lengths in cm A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 3/2. [...]
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index.
17
Nov
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index. it acts as a plane sheet of glass. This implies that the liquid must have refractive index When a biconvex lens of glass [...]
The distance between an object and the screen is 100 cm. A lens produces an image on the screen when the lens is placed at either of the positions 40 cm apart. The power of the lens is approximately
17
Nov
The distance between an object and the screen is 100 cm. A lens produces an image on the screen when the lens is placed at either of the positions 40 cm apart. The power of the lens is approximately The distance between an object and the screen is 100 cm. A lens produces an image [...]
A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens
17
Nov
A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens A convex lens of glass [...]
An illuminated object is placed on the principal axis of a converging lens so that a real image is formed on the other side of the lens. If the object is shifted a little,
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Nov
An illuminated object is placed on the principal axis of a converging lens so that a real image is formed on the other side of the lens. If the object is shifted a little, An illuminated object is placed on the principal axis of a converging lens so that a real image is formed on [...]
In displacement method, the lengths of images in the two positions of the lens between the object and the screen are 9 cm and 4 cm respectively. The length of the object must be
17
Nov
In displacement method, the lengths of images in the two positions of the lens between the object and the screen are 9 cm and 4 cm respectively. The length of the object must be In displacement method the lengths of images in the two positions of the lens between the object and the screen are [...]
The distance between the object and its real image formed by a convex lens cannot be
17
Nov
The distance between the object and its real image formed by a convex lens cannot be The distance between the object and its real image formed by a convex lens cannot be November 17, 2020 Category: Cengage NEET by C.P Singh , Chapter 18 - Refraction at Spherical Surfaces , Part 2 ,
A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then,
17
Nov
A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then, A biconvex lens of focal length f forms a circular image of sun of radius r in focal plane. Then November 17, 2020 Category: Cengage NEET by C.P Singh , Chapter 18 - Refraction at [...]