Top 20 questions of Light class 10 science
Top 20 questions of Light class 10 science (part 2)
- Magnification produced by a concave mirror of a body 4.0 cm in size is 0.16. What is the size of image?
- Define the principal focus of a concave mirror.
- Find the power of a concave lens of focal length 2 m.
- What is minimum number of rays required for locating the image formed by a concave mirror for an object. Draw a ray diagram to show the formation of a virtual image by a concave mirror. (Delhi 2009)
- The refractive index of water is 1.33 and the speed of light in air is 3x 10,8 ms-1. Calculate the speed of light in glass. (foreign 2009)
- Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface. (Delhi 2008)
- With respect to air, the refractive index of ice is 1.31 and that of rock salt is 1.54. Calculate the refractive index of rock salt with respect to ice. (Delhi 2005)
- A convex lens has a focal length of 40 cm. Calculate its power. (Foreign 2005)
- Prove that for a concave mirror the radius of curvature is twice its focal length. (Foreign 2001)
- A ray of light incident on an equilateral glass prism shows minimum deviation of 30.c Calculate the speed of light through the glass prism. (AI 2001)
- A ray of light while travelling from a denser to a rarer medium undergoes total internal reflection. Derive the expression for the critical angle in terms of the speed of light in the respective media.
- A convex mirror used on an automobile has a focal length of 3.00 m. If a vehicle behind is at a distance of 5.00 m, find the location of the image?
- State the basic laws of reflection.
- What is the distance between the image and the plane mirror, if the object is at 15 m?
- How can we find the (rough) focal length of a concave mirror?
- How do we distinguish a medium to be rarer or denser? Give two reasons.
- An object is placed at a distance of one and a half of the focal length of a concave mirror. Find the position of image in terms of f. Also find the magnification and nature of image formed by a concave mirror.
- For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.
- A convex lens has a focal length of 10 cm. At what distance from the lens should the object be placed so that it forms a real and inverted image 20 cm away from the lens? What would be the size of the image formed if the object is 2 cm high? With the help of a ray diagram show the formation of the image by the lens in this case.
- A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. (Delhi 2007)
