A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first color to emerge is.

Options

A. blue
B. green
C. violent
D. red

Explanation

To solve the question of which color emerges first when a short pulse of white light travels through a glass slab at normal incidence, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding White Light**: White light is composed of multiple colors, which can be represented by the acronym VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red). Each color has a different wavelength.

2. **Normal Incidence**: When light strikes the glass slab at normal incidence, it does not change direction. This means that all colors enter the glass slab without bending.

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