What is Hypermetropia? Which type of lens is used to rectify it? [2+1]

Define dispersion of light. How would you identify monochromatic light and composite light with the help of a prism? [1 + 2]

Write down the relationship between relative refractive index and absolute refractive index. On which factors does the relative refractive index of a medium depend? [1 + 2] OR Show that if a monochromatic light ray passes symmetrically through an equilateral prism then the angle of deviation of that ray will be minimum

What is long-sightedness? What type of lens is used to remedy this defect? [2+1]

What type of lens is used as a magnifying glass?

Why is the red colour selected for danger signal lights?

Explain with a suitable ray diagram the process of formation of image by a concave lens.

For which value of the angle of incidence in refraction of light is Snell's law not applicable?

Which type of mirror produces a virtual, diminished and erect image? (a) Plane mirror (b) Concave mirror (c) Convex mirror (d) Parabolic mirror

Explain with a diagram why the sky appears blue.

For the same angle of incidence, the angles of refraction in three different media A, B and C are 30°, 45° and 60° respectively. In which medium is the speed of light minimum and why? [3]

Write two causes of short-sightedness or myopia. Which type of lens is used to correct it? [2+1]

Where is the image formed if the object is placed in between f and 2f of a convex lens ?