Question

A ray of light comes and falls on an object and creates a dark coloured shadow of the object on the screen, then which of the following could be the object?
1. Table
2. Glass slab
3. Butter paper
4. Vegetable oil

• A. 1, 3 and 4
• B. 2, 3 and 4
• C. 1, 2 and 3
• D. 1, 2 and 4

Answer 1

The correct option is A 1, 3 and 4

A ray of light comes and falls on an object creating a dark coloured shadow on the screen then the object could be opaque or translucent. Opaque and translucent objects cast a shadow while transparent objects don't.
Shadows are the dark patch formed by an object. It is formed when the light from a source is obstructed by an object. All types of objects will not cast shadows. An object, something blocking the light source, casts shadows. Opaque objects can produce shadows because they do not allow the light to pass through them. Hence, they form a dark patch on the other side of the object.
Translucent objects allow light partially to pass through them. So they do cast shadows.
If we take a glass slab, no shadow is formed because it allows light to pass through it.Hence, they do not form any dark patches.
In the case of butter paper and vegetable oil, they are translucent. They allow some amount of light to pass through it. So, they will cast a shadow.
Hence, table, butter paper and vegetable oil can cast shadows.