Red colour is used in danger signal

State whether the following statements are True or False: The red colour used during Rang Panchami contains high proportion of lead.

Fill in the blank: The red colour used on Rang Panchami is very dangerous as it contains a high proportion of………in it.

On investigation of light from three different stars A, B and C, it was found that in the spectrum of A, the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations, it can be concluded that

After cataract operation, a person is recommended with concave - convex, spectacles of curvatures 10 cms and 50 cm. Crown glass of refractive indices (1.51) for red and (1.53) for violet colours is used for this. Calculate the lateral chromatic aberration occurring due to these glasses.

After cataract operation, a peisun is recommended with concavo-convex spectacles of curvatures 8 cm and 40 cm. Crown glass of refractive indices 1.51 for red and 1.53 for violet colours is used for this. The lateral chromatic aberration occuring due to these glasses is

Precious Red coral used in Jewellery is

Give 5 flags of different colours, how many different-signal can be generated. If each signal requires the use of 2 flags one below the other.

A beam of light consisting of red, and blue colours is incident on a right-angled prism ABC. The refractive indices of the material of the prism for the red and blue wavelength are 1.39 and 1.47 respectively. The colour/colours transmitted through the face AC of the prism will be