(a) Draw a ray diagram showing the image formation by a compound microscope. Hence obtain expression for total magnification when the image is formed at infinity.

Draw a simple ray diagram showing the formation of a primary rainbow.

Draw the labelled ray diagram for the formation of image by a compound microscope. Derive the expression for the total magnification of a compound microscope. Explain why both the objective and the eyepiece of a compound microscope must have short focal lengths.

The image formed by an objective of a compound microscope is

The image formed by an objective of a compound microscope is

Draw a ray diagram showing the formation of image of a point object by a plane mirror.

Draw aray diagram to show the image formation of a distant object by a refracting telescope. Write the expression for its angular magnification in terms of the focal lengths of the lensesused. State the important considerations required to achieve large resolution and their consequent limitations.

(a) Draw a ray diagram to show the image formation by a combination of two thin convex lenses in contact . Obtain the expression for the power of this combination in terms of the focal lengths of the lenses. (b) A ray of light passing from air through an equilateral glass prism undergoes minimum deviation when the angle of incidence is (3)/(4)^(th) of the angle of prism . Calculate the speed of ltbRgt light in the prism.

(a) Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision. (b) The total magnification produced by a compound microscope is 20. The magnification produced by the piece is 5. The microscope is focused on a certain object. The distance between the objective and eyepiece is observed to be 14cm. If least distance of distinct vision is 20cm, calculate the focal length of the objective and the eye piece.

Draw ray diagrams showing the image formation by a convex mirror when an object is placed (a) at infinity (b) at finite distance from the mirror