Light Test - 40...

Which of the following statements is not correct for Braille  system?

The incident ray, the reflected ray and the .......... all lie on the ....... plane.

Mark the statements which is true for Braille system:

Which of the following statement is true for laws of reflection?

According to laws of reflection, the angle of incidence is equal to the angle of reflection. On what condition this statement is true?

Match the columns:
i) Visual aids             a) used for minor eye defects or partial blindness.
ii) Electronic aids      b) includes cassettes, tape recorders, talking books.
iii) Auditory aids       c) used for people having little vision.
iv) Optical aids          d) available for performing computational tasks.

A man goes to a barber shop with two mirrors placed parallel and facing each other. He observes himself in one of the mirrors. How many images will he see?

If the tube of a kaleidoscope is filled with thick black smoke, the pattern:

Two parallel plane mirrors placed facing each other forms $$\infty$$ images of an object. Does this hold good, if they are placed at an angle $$\theta \neq 0$$?

Minimum number of mirrors used in a kaleidoscope is: