MICROSCOPE
- This is an optical instrument, which helps us to see tiny (very small) objects.
- It is classified as
- Simple microscope
- Compound microscope
Simple Microscope
- A simple microscope has a convex lens of a short focal length.
- It is held near the eye to get an enlarged image of small objects.
Uses of Simple microscope
Simple microscopes are used
- By watch repairers and jewellers.
- To read small letters clearly.
- To observe parts of flowers, insects etc.
- To observe fingerprints in the field of forensic science.
Compound microscope
- The compound microscope is also used to see tiny objects. It has better magnification power than a simple microscope.
- The magnification power of microscopes can be increased by decreasing the focal length of the lens used.
- Due to constructional limitations, the focal length of the lens cannot be decreased beyond a certain limit.
- This problem can be solved by using two separate biconvex lenses.
Construction
- A compound microscope consists of two convex lenses. The lens with the shorter focal length is placed near the object and is called as ‘objective lens’ or ‘objective piece.
- The lens with a larger focal length and larger aperture placed near the observer’s eye is called as ‘eye lens’ or ‘eyepiece.
- Both the lenses are fixed in a narrow tube with adjustable provision.
Also Read
- Nature of universe / பேரண்டத்தில் இயல்புகள்
- General Scientific Law / பொது அறிவியல் விதிகள்
- Electricity and Electronics / மின்னியல் மற்றும் மின்னணுவியல்
- Elements and Compounds / தனிமங்களும் சேர்மங்களும்
- Carbon / கார்பன்
- Nitrogen and their compounds / நைட்ரஜன் மற்றும் அதன் சேர்மங்கள்
- Fertilizer / உரங்கள்
- Pesticides / களைக்கொல்லி
- Insecticides / பூச்சிக்கொல்லி
- Blood and blood circulation / இரத்தம் மற்றும் இரத்த சுழற்சி மண்டலங்கள்
- Endocrine system reproductive system / நாளமில்லா சுரப்பி மண்டலம், இனப்பெருக்க மண்டலம்