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Standard X

Physics

Prism

The following...

Question

The following diagrams show the splitting up of a composite light into its constituent colours.

Which among the above figures is correct?

(i)

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(ii)

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(iii)

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both (iii) and (i)

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Solution

The correct option is A
(i)

Seven colours constitute visible spectrum of light i.e. VIBGYOR with red at the higher end of wavelengths and violet at the lower end of the wavelengths. The colour with the shorter wavelength is more deviated as its refractive index is high than that with a longer wavelength. Red colour has larger wavelength compared to the violet colour. So, violet colour is deviated more compared to red colour. Hence, figure (i) is correct.

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Similar questions

Select the correct alternative :

(a) The speed of light in air or vacuum is :

(i) $3 \times 10^{8} m s - 1$

(ii $2.25 \times 10^{8} m s^{- 1}$

(iii) $3.32 m s^{- 1}$

(iv) $2.0 \times 10^{8} m s^{- 1}$

(b) A ray of light moving from an optically rarer to a denser medium :

(i) bends away from the normal

(ii) bends towards the normal

(iii) remains undeviated

(iv) none of the above.

(i) angle of deviation

(ii) angle of incidence

(iii) angle of refraction

(iv) angle of emergence.

(d) The property of splitting of white light into its seven constituent colours is known as :

(i) rectilinear propagation

(ii) refraction

(iii) reflection

(iv) dispersion.

(e) The seven colours in the spectrum of sunlight in order, are represented as :

(i) VIBGYOR (ii) VIGYBOR

(iii) BIVGYOR (iv) RYOBIVG

(f) A ray of light passing through centre of curvature of a spherical mirror, after reflection :

(i) passes through the focus

(ii) passes through the pole

(iii) becomes parallel to the principal axis

(iv) retraces its own path.

(g) If the radius of curvature of a concave mirror is 20 cm, its focal length is :

(i) 10 cm (ii) 20 cm

(iii) 40 cm (iv) 80 cm.

(h) The image formed by a convex mirror ix :

(i) erect and diminished

(ii) erect and enlarged

(iii) inverted and diminished

(iv) inverted and enlarged.

(i) The image formed by a concave mirror is of the same size as the object, if the object is placed :

(i) at the focus

(ii) between the pole and focus

(iii) between the focus and centre of curvature

(iv) at the centre of curvature.

(j) A convex mirror is used :

(i) as a shaving mirror

(ii) as a head mirror by a dentist

(iii) as a rear view mirror by a driver

(iv) as a reflector in torch.

Ans. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(i), (f)-(iv), (g)-(i), (h)-(i), (i)-(iv), (j)-(iii)

The following diagrams show the splitting up of a composite light into its constituent colours.

Which among the above figures is correct?

Q. A beam of white light passing through a prism is split up into its constituent colours. The light which undergoes least deviation is

Q. The splitting of white light into its constituent colours is called ___.

Q. Dispersion of light is the splitting of white light into its seven constituent colours.

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The following diagrams show the splitting up of a composite light into its constituent colours. Which among the above figures is correct?

The following diagrams show the splitting up of a composite light into its constituent colours.

Which among the above figures is correct?