Question

Why we should close our eyes when a student focussed a bright light to our eyes?

Answer 1

In low light, the pupil expands to allow more light into the eye. In bright light, it contracts to protect the eye and increase contrast. Behind the pupil lies the crystalline lens, which is responsible for focusing light.

Answer 2

✌️✌️ hey mate,

➡️ᴛʜᴇ ᴀᴍᴏᴜɴᴛ ᴏғ ʟɪɢʜᴛ ᴇɴᴛᴇʀɪɴɢ ᴛʜᴇ ᴇʏᴇ ɪsᴄᴏɴᴛʀᴏʟʟᴇᴅ ʙʏ ᴛʜᴇ ᴍᴜsᴄʟᴇs ᴏғ 
ᴛʜᴇ ɪʀɪs ᴡʜɪᴄʜ ᴄᴏɴᴛʀᴀᴄᴛ ᴏʀ ᴅɪʟᴀᴛᴇ 
ᴛʜᴇ ᴘᴜᴘɪʟs.

➡️ ᴛʜᴇ ᴘᴜᴘɪʟʙᴇᴄᴏᴍᴇs ʟᴀʀɢᴇʀ ɪɴ ʟᴇss 
ʟɪɢʜᴛ ᴛᴏ ᴀʟʟᴏᴡ ᴍᴏʀᴇ ʟɪɢʜᴛ ᴛᴏ ɢᴏ ɪɴ 
ᴀɴᴅ ɪɴ ʙʀɪɢʜᴛ ʟɪɢʜᴛ ɪᴛ ᴄᴏɴsᴛʀɪᴄᴛs ᴏʀ ʙᴇᴄᴏᴍᴇs sᴍᴀʟʟᴇʀ ᴛᴏ ʀᴇsᴛʀɪᴄᴛ ᴛʜᴇ 
ᴀᴍᴏᴜɴᴛ ᴏғ ʟɪɢʜᴛ ɢᴏɪɴɢ ɪɴ.

thanks...
nice to help you ✌️✌️