Q30 of 56 Page 1

A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?

To get the focal length of the mirror, the student should measure the distance between mirror and screen because when the object is at infinity, the image is formed at focus i.e. between screen and mirror. So, the distance between screen and mirror should be measured.

More from this chapter

All 56 →
28

A student was asked to observe and identify the various parts of an embryo of a red kidney bean seed. He identified the parts and listed them as under:

I. Tegmen II. Testa


III. Cotyledon IV. Radicle V. Plumule


The correctly identified parts among these are:

 29

Given below is the list of vegetables available in the market. Select from these the two vegetables having homologous structures:

Potato, sweet potato, ginger, radish, tomato, carrot, okra (Lady's finger)

 31

A student used a device (X) to obtain/focus X the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X).

 32

A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence. He observes all possible precautions at each step of the experiment. At the end of the experiment, on analyzing the measurements, which of the following conclusions is he likely to draw?