Chapter-Chapter 11. Light, Shadows and Reflections Science Curiosity class 7 in english Medium CBSE Notes

Chapter 11: Light, Shadows and Reflections

Definitions:

Light: Light is a form of energy that enables us to see objects.

Source of Light: A source of light is an object that emits light.

Transparent Objects: Objects that allow light to pass through completely.

Translucent Objects: Objects that allow light to pass partially.

Opaque Objects: Objects that do not allow light to pass through.

Shadow: A shadow is a dark region formed when an object blocks the path of light.

Reflection: Reflection is the bouncing back of light from a surface.

Plane Mirror: A plane mirror is a flat mirror that forms an upright image.

Image: An image is the picture formed by reflection of light.

Lateral Inversion: Lateral inversion is the reversal of left and right in an image formed by a mirror.

Pinhole Camera: A pinhole camera is a device that forms an image using a small hole instead of a lens.

Quick Revision Points:

• Light helps us see objects.
• Objects can be transparent, translucent, or opaque.
• Shadows are formed when light is blocked.
• Light travels in straight lines.
• Reflection occurs on smooth surfaces.
• Plane mirrors form upright and same-size images.
• Images in mirrors are laterally inverted.
• Pinhole camera forms inverted images.
• Light is important for daily life and vision.
• Reflection is used in many devices.

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