## Figure 9.37 shows an equiconvex lens (of refractive index 1.50) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 45.0 cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30.0 cm. What is the refractive index of the liquid?

Figure 9.37 shows an equiconvex lens (of refractive index 1.50) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is Read More …

## Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.36. A current in the coil produces a deflection of 3.5°of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?

Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.36. A current in the coil produces a deflection of 3.5°of the mirror. What is the displacement of the reflected spot of light on Read More …

## A Cassegrain telescope user two mirror as shown in Fig. 9.33 Such a telescope is built with the mirror 20 mm apart. If the radius of curvature of the large mirror is 220mm and these all mirror is 140mm, where will the final image of an object at infinity be?

A Cassegrain telescope user two mirror as shown in Fig. 9.33 Such a telescope is built with the mirror 20 mm apart. If the radius of curvature of the large mirror is 220mm and these all mirror is 140mm, where will the Read More …

## (a) For the telescope described in Exercise 9.34 (a), what is the separation between the objective lens and the eyepiece?

(a) For the telescope described in Exercise 9.34 (a), what is the separation between the objective lens and the eyepiece? (b) If this telescope is used to view a 100 m tall tower 3 km away, what is the height of Read More …

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