THE COLOURFUL WORLD ADDITIONAL QUESTIONS
CLASS - X SUBJECT - SCIENCE
Why is red color selected for danger signal lights?
(a) What is dispersion of white light? What is the cause of this dispersion? Draw a
dimgram to show the dispersion of white light by a glass prism,
(b) a glass prism is able to produce a spectrum when white light passes through it but a
glass slab does not produce any spectrum. Explain why?
3. Which of the following colors is least scattered by fog, dust of smoke?
2 Violet
h. Bhue
Red
d Yellow
+ The colored light that refracts most while passing through a prism is
. Yellow
h. Violet
5 Which of the following is a natural phenomenon which is caused by the dispersion
of sunlight in the sky?
(a) Twinkling of stars
by Stars seem higher than they actually are
(c) Advanced sunrise and delayed sunset
(d) Rainbow
6. Name the scientist who was the first to use a glass prism to obtain the spectrum
of sunlight
(a) Isaac Newton
(b) Einstein
c) Kepler
1) Hans Christian Oersted
Answers
Answer:
BECAUSE RED IS NOTICED FROM TOO FAR PERSON BECAUSE IT IS DARK
Explanation:
An optical prism is a transparent optical element with flat, polished surfaces that refract light. At least one surface must be angled—elements with two parallel surfaces are not prisms. The traditional geometrical shape of an optical prism is that of a triangular prism with a triangular base and rectangular sides, and in colloquial use "prism" usually refers to this type. Some types of optical prism are not in fact in the shape of geometric prisms. Prisms can be made from any material that is transparent to the wavelengths for which they are designed. Typical materials include glass, plastic, and fluorite.Light changes speed as it moves from one medium to another (for example, from air into the glass of the prism). This speed change causes the light to be refracted and to enter the new medium at a different angle (Huygens principle). The degree of bending of the light's path depends on the angle that the incident beam of light makes with the surface, and on the ratio between the refractive indices of the two media (Snell's law). The refractive index of many materials (such as glass) varies with the wavelength or color of the light used, a phenomenon known as dispersion. This causes light of different colors to be refracted differently and to leave the prism at different angles, creating an effect similar to a rainbow. This can be used to separate a beam of white light into its constituent spectrum of colors. A similar separation happens with iridescent materials, such as a soap bubble. Prisms will generally disperse light over a much larger frequency bandwidth than diffraction gratings, making them useful for broad-spectrum spectroscopy. Furthermore, prisms do not suffer from complications arising from overlapping spectral orders, which all gratings have.
2" RED
A rainbow is a natural phenomenon caused by the dispersion of sunlight in the sky
Isaac Newton
PLZ MARK AS A BRAIN LST